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macOS Catalina updates improve the stability, performance, or compatibility of your Mac and are recommended for all Catalina users. To get these updates, choose System Preferences from the Apple menu , then click Software Update. Learn more about updating the software on your Mac.

Your Brother MFC-9340CDW FAQs answered. 'ControlCenter needs to be updated.' - macOS 10.15 Catalina. The macOS Catalina 10.15.2 update improves the stability, reliability and performance of your Mac and is recommended for all users. This update adds the following features: Apple News. New layout for Apple News+ stories from The Wall Street Journal and other leading newspapers; Stocks. 6/10 (152 votes) - Download macOS Catalina Mac Free. MacOS Catalina is the first version of the Apple computer operating system, previously known as OS X, to exclusively support 64-bit apps on the system. Version 10.15 of the Apple operating system for Mac PCs has been named after the southern. Set up content caching on Mac. On your Mac, you can turn content caching on or off, choose a volume for the content cache, set the cache size, share cached content with iOS or iPadOS devices, or delete all cached content.

For details about the security content of these updates, see Apple Security Updates.

• macOS 10.15
  

macOS Catalina 10.15.7

macOS Catalina 10.15.7 provides important security updates and bug fixes for your Mac.

• Resolves an issue where macOS would not automatically connect to Wi-Fi networks
• Fixes an issue that could prevent files syncing through iCloud Drive
• Addresses a graphic issue that may occur on iMac (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XT

Some features may not be available for all regions, or on all Apple devices.

macOS Catalina 10.15.6

macOS Catalina 10.15.6 introduces local news in your Today feed in Apple News and improves the security and reliability of your Mac.

Apple News

• Local news in your Today feed provides extensive coverage of San Francisco, the Bay Area, Los Angeles, Houston, and New York City
• More stories available from local news providers with a subscription to Apple News+
• Your daily newsletter from Apple News can now be personalized with stories that reflect your interests

This update also includes bug fixes and other improvements.

• Adds a new option to optimize video streaming on HDR-compatible Mac notebooks for improved battery life
• Fixes an issue where the computer name may change after installing a software update
• Resolves an issue where certain USB mouse and trackpads may lose connection

Enterprise content:

• When using the built-in keyboard with a non-U.S. keyboard layout on some Mac models, passwords with certain characters are no longer rejected at the Mac login window
• Allows command-line tools that don't use CFNetwork, such as curl(1), to continue connecting to TLS servers that use certificates issued by the recently expired AddTrust External CA Root
• Major new releases of macOS can be hidden when using the softwareupdate(8) command with the --ignore flag, if the Mac is enrolled in Apple School Manager, Apple Business Manager, or a user-approved MDM.
  This change also affects macOS Mojave and macOS High Sierra after installing Security Update 2020-004.

Some features may not be available for all regions, or on all Apple devices.

macOS Catalina 10.15.5

macOS Catalina 10.15.5 introduces battery health management in the Energy Saver settings for notebooks, a new option to disable automatic prominence in Group FaceTime calls, and controls to fine-tune the built-in calibration of your Pro Display XDR. The update also improves the stability, reliability, and security of your Mac.

Battery Health Management

• Battery health management to help maximize battery lifespan for Mac notebooks
• Energy Saver preference pane now displays battery condition and recommends if the battery needs to be serviced
• Option to disable battery health management
  For more information, please visit https://support.apple.com/kb/HT211094

FaceTime Prominence Preference

• New option to control automatic prominence on Group FaceTime calls, so video tiles do not change size when a participant speaks

Calibration Fine-Tuning for Pro Display XDR

• Controls to fine-tune the built-in calibration of your Pro Display XDR by adjusting the white point and luminance for a precise match to
  your own display-calibration target

This update also includes bug fixes and other improvements:

• Fixes an issue that may prevent Reminders from sending notifications for recurring reminders
• Addresses an issue that may prevent password entry on the login screen
• Fixes an issue where System Preferences would continue to show a notification badge even after installing an update
• Resolves an issue where the built-in camera may not be detected when trying to use it after using a video conferencing app
• Addresses an issue for Mac computers with the Apple T2 Security Chip where internal speakers may not appear as a sound output device in Sound preferences
• Fixes a stability issue with uploading and downloading media files from iCloud Photo Library while your Mac is asleep
• Resolves a stability issue when transferring large amounts of data to RAID volumes
• Fixes an issue where the Reduced Motion Accessibility preference did not reduce the speed of animations in a Group FaceTime call

Enterprise content:

• Improves performance on certain Mac models when enabling hardware acceleration in GPU-intensive apps such as those used for video conferencing
• Addresses an issue where Microsoft Exchange accounts were unable to sign in during account setup when using Conditional Access
• Apple Push Notification Service traffic now uses a web proxy when specified in a PAC file via the Proxies payload
• Resolves an issue that prevented some displays connected to MacBook Pro (16-inch, 2019) from waking from sleep when the Mac wakes
• Major new releases of macOS are no longer hidden when using the softwareupdate(8) command with the --ignore flag
  This change also affects macOS Mojave and macOS High Sierra after installing Security Update 2020-003.

macOS Catalina 10.15.4

macOS Catalina 10.15.4 introduces iCloud Drive folder sharing, Screen Time communication limits, Apple Music time-synced lyrics view, and more. The update also improves the stability, reliability, and security of your Mac.

Finder

• iCloud Drive folder sharing from Finder
• Controls to limit access only to people you explicitly invite, or to grant access to anyone with the folder link
• Permissions to choose who can make changes and upload files, and who can only view and download files

Screen Time

• Communication limits for controlling who your children can communicate with and be contacted by throughout the day and during downtime
• Playback control of music videos for your children

Music

• Time-synced lyrics view for Apple Music, including the ability to jump to your favorite part of a song by clicking a line in lyrics view

Safari

• Option to import Chrome passwords into your iCloud Keychain for easy AutoFill of your passwords in Safari and across all your devices
• Controls for duplicating a tab and for closing all tabs to the right of the current tab
• HDR playback support on compatible computers for Netflix content

App Store with Apple Arcade

• Universal Purchase support enables the use of a singular purchase of a participating app across iPhone, iPod touch, iPad, Mac, and Apple TV

Pro Display XDR

• Customized reference modes that you can tailor to specific workflow needs by selecting from several color gamut, white point, luminance, and transfer function options

Accessibility

• Head pointer preference for moving a cursor on the screen based on the precise movements of your head

This update also includes bug fixes and other improvements:

• High Dynamic Range output to HDR10-compatible third-party displays and TVs connected with DisplayPort or HDMI
• OAuth authentication support with Outlook.com accounts for improved security
• CalDav migration support when upgrading to iCloud reminders on a secondary device
• Addresses an issue where text copied between apps may appear invisible when Dark Mode is active
• Resolves an issue in Safari where a CAPTCHA tile may display incorrectly
• Fixes an issue where you may receive notifications for updated or completed reminders
• Fixes an issue with screen brightness for the LG UltraFine 5K display after waking from sleep

Enterprise content:

• Apple Push Notification Service traffic now uses a web proxy when specified in a PAC file
• Resolves an issue where updating the login keychain password after resetting a user password would cause a new keychain to be created
• After enabling ”Search directory services for certificates” in Keychain Access preferences, searching by email address in Keychain Access or Mail now locates a user certificate stored in directory services
• When setting the DisableFDEAutoLogin key in com.apple.loginwindow, you can now sync your FileVault password with the Active Directory user password after updating the user password
• Reinstates the ability to update or restore iOS, iPadOS, or tvOS devices by dragging .ipsw files to the device in an Apple Configurator 2 window
• Addresses an issue where sending the EraseDevice MDM command might not cause the device to be erased
• When logging in as an Active Directory user after using deferred FileVault enablement, the user is now prompted for their password to enable FileVault

Some features may not be available for all regions, or on all Apple devices.

macOS Catalina 10.15.3

The macOS Catalina 10.15.3 update improves the stability, reliability, and security of your Mac, and is recommended for all users.

• Optimizes gamma handling of low gray levels on Pro Display XDR for SDR workflows when using macOS
• Improves multi-stream video editing performance for HEVC and H.264-encoded 4K video on the MacBook Pro (16-inch, 2019)

macOS Catalina 10.15.2

The macOS Catalina 10.15.2 update improves the stability, reliability and performance of your Mac and is recommended for all users.

This update adds the following features:

Apple News

• New layout for Apple News+ stories from The Wall Street Journal and other leading newspapers

Stocks

• Get links to related stories or more stories from the same publication at the end of an article
• “Breaking” and “Developing” labels for Top Stories
• Stories from Apple News are now available in Canada in English and French

This update includes the following bug fixes:

Music

• Restores the column browser view for managing the music library
• Resolves an issue that may prevent album artwork from appearing
• Fixes an issue that may reset music equalizer settings during playback

iTunes Remote

• Adds support for using an iPhone or iPad to remotely control the Music and TV apps on a Mac

Photos

• Resolves an issue that may cause some AVI and MP4 files to appear as unsupported
• Fixes an issue that prevents newly created folders from appearing in Albums view
• Addresses an issue where manually sorted images in an album may be printed or exported out of order
• Fixes an issue that prevents the zoom-to-crop tool from working in a print preview

Mail

• Addresses an issue that may cause Mail preferences to open with a blank window
• Resolves an issue that may prevent using undo from retrieving deleted mail

Other

• Improves the reliability of syncing books and audiobooks to your iPad or iPhone through the Finder
• Fixes an issue where reminders may be out of order in the Today smart list in the Reminders app
• Resolves an issue that may cause slow typing performance in the Notes app

Enterprise content

• Fixes an issue where the user password might not be accepted at the login window after upgrading a Mac with an Apple T2 Security Chip to macOS Catalina
• Improves compatibility with video conferencing apps on MacBook Pro models introduced in 2018
• Users logged in as a standard user can now install apps from the App Store

macOS Catalina 10.15.1

The macOS Catalina 10.15.1 update includes updated and additional emoji, support for AirPods Pro, HomeKit Secure Video, HomeKit-enabled routers, and new Siri privacy settings, as well as bug fixes and improvements.

Emoji

• Over 70 new or updated emoji, including animals, food, activities, new accessibility emoji, gender-neutral emoji, and skin tones selection for couple emoji

AirPods support

• AirPods Pro support

Home app

• HomeKit Secure Video enables you to privately capture, store, and view encrypted video from your security cameras and features people, animal, and vehicle detection
• HomeKit enabled routers let you control how your HomeKit accessories communicate over the internet or in your home
• Adds support for AirPlay 2-enabled speakers in scenes and automations

Siri

• Privacy settings to control whether or not to help improve Siri and Dictation by allowing Apple to store audio of your Siri and Dictation interactions
• Option to delete your Siri and Dictation history from Siri Settings

This update also includes the following bug fixes and improvements:

• Restores the ability to view file names in the All Photos view in Photos
• Restores the ability to filter by favorites, photos, videos, edited, and keywords in Days view in Photos
• Fixes an issue where Messages would only send a single notification when the option to repeat alerts was enabled
• Resolves an issue that caused Contacts to launch to the previously opened contact instead of the contact list
• Adds a two-finger swipe gesture for back navigation in Apple News
• Resolves issues that may occur in the Music app when displaying playlists inside folders and newly added songs in the Songs list
• Improves reliability of migrating iTunes library databases into the Music, Podcasts, and TV apps
• Fixes an issue where downloaded titles were not visible in the Downloads folder in the TV app

Enterprise content

• When using the built-in keyboard with a non-U.S. keyboard layout, passwords with certain characters are no longer rejected at the Mac login window
• When sign in with Apple ID is not allowed by a configuration profile, the Sign In button in System Preferences is now dimmed

macOS Catalina 10.15

Make your Mac invincible

After summer comes macOS. This long-standing tradition started by Apple is the most exciting moment of the year — seeing your Macs improve and gain new bells and whistles. In 2019, we're welcoming Catalina, the 10.15 version of macOS named after Catalina island in California. Apparently, it's hot.

The operating system boasts a whole lot of new macOS features like Sidecar, iOS apps porting, and major Photos update. To try the features right away, you can install Catalina from the Software Update tab.

However, be prepared for some troubleshooting. The acquaintance with the new macOS doesn't always go smooth — and with macOS 10.15 deeming support for lots of software, many things will not go smooth. We've collected the key macOS Catalina issues you may encounter, along with the ways to fix them.

macOS 10.15 Catalina problems and their fixes

Giving up Catalina is a decision you can choose to make. But before rolling back, ensure you use every bit of advice as to how you can fix the common problems. Sometimes, a quick fix can solve your concerns.

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Problems with macOS Catalina you can solve:

macOS 10.15 Catalina won't install

This is the classic problem that arises with every macOS release: The installation won't start or you face the 'Catalina installation stuck' problem — when it freezes and you see no progress on the install. No matter how many times you start over, you keep getting an error trying to install Catalina.'

How to fix:

• Apple recommends to reset SMC. Shut down your Mac, and hold Shift + Ctrl + Option + Power button for about 10 seconds, with your cable plugged in. Click on the power button and wait for your Mac to start up.
• Try resetting NVRAM or PRAM. Shut down your Mac, and hold Option + Command + P + R for about 20 seconds. Wait for your computer to restart.
• Reinstall from macOS recovery. Hold Option + Command + R to reinstall. Once you see the startup screen, start the installation again.
• Some users reported they were prompted to enter administrator password several times to complete the installation. So it might be something for you to try as well.
• In most cases, macOS Catalina cannot be installed on Macintosh HD, because it doesn't have enough disk space. If you install Catalina on top of your current operating system, the computer will keep all the files and still need free space for Catalina. So the easiest fix would be to clean up your system with CleanMyMac X before upgrading. All the system junk, app leftovers, and unneeded files will go away in a minute.
• Backup your disk and run a clean install. This will wipe away your current system files, leaving space for macOS Catalina — so yes, this option is for the brave. If you use a solid backup solution, you'll keep your data safe, though. Get Backup Pro is a nice way to do it — unlike Apple's Time Machine, the app allows running bootable backups.

Say you've cleared up and backed up your disk. But your Mac still gets stuck at the installation and shows 'not enough space' error, so you can't get out of the cycle. In this case, there's another fix you can try:

1. Reinstall Mojave. No worries, this won't delete your disk. Reboot your Mac and hold Command + R to enter the Recovery Mode. Click Reinstall macOS.
2. Restore from your backup. If you have a Time Machine backup, enter the Recovery Mode again and select 'Restore from Time Machine Backup.' Select the backup from the list and restore your files. Check out how to use apple time machine.

Some users also report they tried to reboot into Safe Mode and take the installation from there; the others used a newly created admin user — but most attempts have been unsuccessful.

We must agree that macOS 10.15 is one of the slowest systems in terms of installation. But if you use the hacks described above and have a little patience, you'll be able to get to the 'Catalina installed' point.

Find more information about how to update mac os the right way.

If you can't login after upgrading to Catalina

There's a known problem of failing to login after the installation. Unfortunately, the only way to fix it — at least for now — would be to roll back to Mojave:

1. Clean up your Mac with CleanMyMac X and backup your data.
2. Save passwords to ensure you don't lose license keys and settings.
3. Create a bootable installer of Mojave (after Catalina goes public, you can download Mojave here).
4. Delete macOS Catalina: Apple menu > Restart > Command + R > Disk Utility > your startup disk > Erase.

One of the things Mac users are particularly excited about is the new Sidecar feature. It comes as a handy solution for those wanting to expand their workspaces. You can either mirror your Mac's screen to iPad or use your iPad's screen as an extension of a Mac.

If the only reason you're here is because you want Sidecar, we have to warn you it might not work with your new macOS. Reddit is full of user reports about the feature unavailable on macOS Catalina. Most likely, this is the issue of compatibility.

How to fix:

Here are the ways to fix Sidecar problems:

• Get the new iPadOS 13. Unfortunately, macOS Catalina doesn't work with iPadOS 12. So basically, you have to use the recent operating systems if you want to try Sidecar.
• Make sure your Mac is one of the compatible devices. Sidecar works on:
  • 2019 Mac Pro
  • Late 2018 Mac mini +
  • Late 2018 MacBook Air +
  • 2017 iMac Pro
  • Mid 2016 MacBook Pro +
  • Early 2016 MacBook +
  • Late 2015 iMac +
• Try connecting your iPad with a cable. With Sidecar, you should be able to connect your iPad wirelessly. If this doesn't work, the cable might solve the issue.

Battery drain on macOS Catalina

Many of the previous macOS releases were known for battery life concerns — greedy apps, Safari and Chrome draining battery, or power-saving not working. There has been no major battery drain issues reported by the Catalina users so far.

How to fix:

Optimum App Update For Macos Catalina 10.15 Download

Just to make sure you don't encounter the problem as well, here are a few precautions:

• Check for apps that use significant energy. For a quick insight, check Apple's in-built Activity Monitor. It shows the 'Energy impact' for every application — calculated based on CPU, network usage, and other factors.
  
• Have a solution for battery health monitoring. iStat Menus is a perfect fit if you need detailed analytics on disk activity, CPU usage, battery life, memory load, and much more. The app shows all the data right in your menu bar. Plus, you can customize what's being monitored flexibly.
  
• Use Screen Time to limit the use of apps. This is the brand-new app on macOS Catalina, which helps you live a healthier Mac user life. Set time limits for the use of specific apps or app categories and schedule downtime. The main goal is to track how much time you spend on the computer, but you can also use it to optimize battery life on Mac.
  

Apps not working on macOS Catalina

In the attempt to speed up your Mac's performance, Apple is killing 32-bit app architecture with the release of Catalina. This means you have to switch to 64-bit, for good. You might see the messages like this when trying to launch an app:

The chances are it's one of the oldies.

How to fix:

CleanMyMac X can pretty much solve every app problem on macOS Catalina.

Uninstall all 32-bit apps in a click

No more digging through the settings. Download CleanMyMac X and batch uninstall every outdated app on Mac.

• Use Updater to search available app updates. Maybe the app is not working, because it needs upgrading. If you've missed the update notification, you won't know about this. To solve the issue, CleanMyMac X will show you the full list of apps with available updates from developers. The best thing is you can run a batch update right in the app.
• Uninstaller gives you an easy way to reset or get rid of 32-bit apps. The Apple way of checking for 32-bit applications is quite easy: access About This Mac > System report > Applications. However, once you find apps with the outdated architecture, you'll have to go and uninstall each of them separately. The Uninstaller feature in CleanMyMac X simplifies things for you — filter by 32-bit and get rid of each of them.
  
• If there's no particular reason an app misbehaves, try resetting it. Guess what, CleanMyMac X has it covered too. In Uninstaller, click on the arrow button next to the app and choose Reset. As easy as that.

While app notarization takes time, you can expect many apps being unavailable after the release of Catalina. This doesn't mean they are gone for good, though. Contact developers or follow official developer announcements to find out about compatibility plans.

OneDrive client problems on Catalina

Due to Catalina's new security settings, Microsoft's OneDrive may have a problem accessing your drive — even if you allow a full access. This is because macOS 10.15 comes with two disk volumes by default.

How to fix:

There are no surefire fixes just yet, but you can try to troubleshoot OneDrive by setting it up from the very beginning. This worked for some users, according to the Reddit discussion:

1. Unlink your account and quit OneDrive.
2. Remove OneDrive client from your Mac and delete the folder.
3. Set up OneDrive again and make sure you allow full disk access in Security & Privacy.

iCloud problems on macOS Catalina

The most common issue with iCloud is that users are unable to download their folders. You can try downloading iCloud files separately — but that's going to be a pain if you have an extensive library.

How to fix:

The best fix would be using Forklift app for your file management. The app is Catalina-ready and allows connecting local drives, Dropbox, iCloud, and tons of other storage sites.

If you're setting up iCloud, there might be another issue standing in your way: Not being able to agree to the Terms and Conditions. The window will just keep popping up on your screen. An easy way to fix this would be to access System Preferences > Internet Accounts and then click on the iCloud icon. You'll see a static Terms and Conditions window — click Accept and you're good to go.

Replacing iTunes on Catalina

The new macOS 10.15 brought along the end of iTunes and the birth of the new Music app. Basically, it looks the same — but with music-only content. There's a huge difference for people who rely on syncing Apple Music with third-party apps. The new app doesn't support XML file support, which makes playlist syncing impossible across many apps. So if you use Apple Music for DJing, you'll definitely have a problem.

How to fix:

The only fix to suggest here would be to stay away from Catalina if you need your XML apps to work with iTunes.

Music library issues

New Music app keeps freezing

There have been reports about the new music app freezing on Mac. Well, it's the first splitting of iTunes, so it's no wonder it doesn't go smooth. In most cases, your Mac will keep showing the 'library updating' status.

How to fix:

1. Create a backup of your entire music library.
2. Move your music out of the music folder.
3. Go to ~/Library and remove every file related to 'Music' and 'iTunes.'
4. Delete music caches in ~/Library/Caches.
5. Restart your Mac and try to access the library again. It should be working now.

Memory usage problems with Apple Music app

Another problem you may come across is the Music app eating too much of your space. One user wrote the app used over 30GB of memory on his Mac.

How to fix:

Apparently, the problem is related to the memory management of Album Art. It is getting better, though. According to user reports, memory usage goes back to normal after restarting the app.

Mail search is broken

According to forum posts, your mailbox might get pretty messy after the upgrade — with no search functionality whatsoever. So if you try searching by keywords or recipient/sender name, the app will keep showing the numerical number of results. The reason could be the new Spotlight integration.

How to fix:

1. Open System Preferences > Internet accounts and remove your mail account.
2. Restart your computer and once again add your mail account to the app.
3. Try searching through your emails — it should be working now.

There have also been some early reports about emails missing from the Mail app — so you might want to wait for it to get fixed before upgrading, especially if you rely on Apple Mail.

Slowing down and overheating macOS Catalina problems

So here's the thing: macOS Catalina should be faster than Mojave. 32-bit architecture was one of the things slowing an operating system down. It's gone, and so are the issues with slow apps. Unfortunately, you can expect your Mac go slow and overheat anyway.

How to fix:

• Too many login items often cause your Mac to go slow. To eliminate the problem, disable apps from launching at startup. Go to System Preferences > Users & Groups > Login Items. Check the apps you don't want to run at startup and click on the minus button.
  
• Reset SMC. This is a universal fix that helps solve the issues with overheating, battery life, slow Mac, and more. The process is pretty simple and doesn't impose any risks of losing your data. To reset, shut down your Mac, but leave a charger plugged in. Hold Shift + Ctrl + Option + Power button for about 10 seconds. Click on the power button and wait for your Mac to start up.

Dock disappearing on macOS Catalina

On the Apple forum, people mentioned Dock disappearing from their screen after upgrading to Catalina. The nature of this mistake is unknown — some users connect it to PRAM resetting, the others say they had the issue when trying to work across two screens.

How to fix:

Try Option + Command + D. If it doesn't work for you, do the following:

1. Go to Settings > Dock
2. Change the Dock's size so that it starts flickering
3. Change the hide/show settings
4. Customize the Dock's position on screen (you can do it randomly).
5. Close the window and check whether it's working now.

Internet not working after upgrading to Catalina

If you're putting macOS 10.15 over your current system, you're likely to encounter Internet connection problems.

How to fix:

The radical way would be to clean install macOS Catalina — it's healthier for your Mac and will probably fix the issue. If you're not ready to take a risk, try rebooting your Mac.

There has been a user report saying that Sophos caused the problem of network connection. So uninstalling it may be a fix as well.

Bluetooth not available on macOS Catalina

Well, that's a problem. Definitely a huge one if you use AirPods. Deleting your Bluetooth.plist files might be the way to solve this.

How to fix:

1. Open Finder > Go > Go to Folder
2. Type Library/Preferences
3. Find a file with the name 'com.Apple.Bluetooth.plist' and delete it.

Safari extensions not working

While Apple is trying to transition to iOS-compatible extensions, it gradually deems support for many web extensions formats. On Catalina, you'll face the problem with .safariextz files not working.

How to fix:

Just like with 32-bit apps, there's no way to fix the missing extensions. If you can't find a good alternative, you can switch to Chrome or another browser.

Storage filling up too fast

If you notice unusual storage filling up progress, this might mean your Mac captured too many redundant files during the Catalina installation. In most cases, these are APFS files and Time Machine backups.

How to fix:

If you can use a good Time Machine alternative like Get Backup Pro throughout the upgrade, do it. Otherwise, you can remove Time Machine leftovers after installing Catalina with CleanMyMac X. In the Maintenance tab, select 'Time Machine snapshots thinning,' and run a cleanup.

To remove snapshots manually, use the following Terminal commands:

• To view the list of snapshots:
  tmutil listlocalsnapshots / tmutil listlocalsnapshots /System/Volumes/Data
• To delete snapshots:
  deletelocalsnapshots

Here's a quick review of all mentioned fixes, which you can take with you:

Is macOS Catalina stable?

The short answer is yes — if you use it right. So before you decide to downgrade back to Mojave, make sure you've done the following things right:

1. Backup your Mac with Get Backup Pro or any other reliable tool before running an installation.
2. If you still need some of the Mojave functionality that won't be available in Catalina, install the new macOS on partition.
3. Make your Mac as clean as possible before upgrading.
4. Get iPadOS 13 if you want to use the Sidecar feature.
5. Get rid of 32-bit applications, even if this means killing your darlings.
6. Backup your Music and then empty the folder along with music-related Library caches. The new Apple Music app is still pretty much unpredictable, so you need to ensure you don't lose your playlist.
7. CleanMyMac X is a solution for many Catalina issues, so you need it — badly. To cut the cost, you can get it through Setapp and receive extra tools like Get Backup Pro and Endurance.

If you want to dive more into macOS Catalina bugs fixed, check out the Reddit discussion.