Summary: This article discusses all macOS Catalina known issues and solutions you want to know, from hardware or apps that won't work after macOS Catalina update to data loss, especially Mac not booting problems.

Apple has just released the latest macOS Catalina 10.15, and many enthusiastic users would like to install the newest macOS on their Mac. Nevertheless, you probably are suffering from some annoying Catalina problems. For example, you can't download/install macOS Catalina, apps won't work, iCloud is not available, or you have connectivity issues with yout WiFi or Bluetooth on macOS Catalina.

Therefore, this post discusses some common macOS Catalina upgrade issues that you're concerned with as well as how to fix these problems. Now, let's check the table below and see if you can find a solution to your problem.

Table of contents: 1. Should I install macOS 10.15 Catalina on my Mac now?; 2. Can't install macOS Catalina on Mac; 3. macOS Catalina runs into low disk space during installation; 4. Can I install the macOS 10.15 alongside macOS Mojave?; 5. Mac won't boot/turn on after installing macOS 10.15Hot; 6. macOS Catalina update is stuck/frozen; 7. Sidecar errors: Service Not Supported; 8. Apps won't work in macOS Catalina; 9. Native Instruments products are not compatible with macOS Catalina; 10. macOS Catalina keeps asking for Apple ID; 11. Apps icons go missing in the Finder; 12. WiFi/Bluetooth is not working on macOS Catalina; 13. iCloud is not available after macOS update; 14. External hard drives/mouse/keyboard is not working in macOS Catalina; 15. macOS Catalina makes Mac slow/overheating; 16. Files, documents, or folders get lost after update; 17. External drive is read-only in macOS Catalina

Warning: This post will include multiple macOS Catalina problems, and some serious problems like 'Mac not booting after update' could cause data loss. Therefore, if you are facing some Mac booting issue after macOS update, it is highly recommended to recover the lost files from the unbootable Mac with iBoysoft Mac Data Recovery first.

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Support OS: macOS 10.15 Catalina and earlier Mac operating systems

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Of course, the newly released version of macOS 10.15 Catalina may have some uncertain issues that need to be improved and revised during its optimization. Thus, it is possible that you have issues with the installation of the newest macOS. Whether you have installed macOS Catalina or still sit on the fence, this article is worthy of reading.

The following part covers some common macOS Catalina upgrade problems as well as how to address these issues.

Now, let's check the possible macOS Catalina 10.15 issue and find the corresponding solutions to your problems one by one.

1. Should I install macOS 10.15 Catalina on my Mac now?

You may be wondering if macOS Catalina is stable to use on your Mac since the newest macOS Catalina is so tempting to install. Should you install macOS 10.15 Catalina on your Mac? Well, it depends.

If you want to try these new features or you are developers who work on computers and apps, you can have a bash to install macOS Catalina to improve the user experience.

But if you are an ordinary user who can't handle possible problems of the newest version, to be honest, you are not advised to install it on your Mac. However, if you are curious about the newest operating system, you could install it on an idle computer without interrupting your normal work.

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2. Can't install macOS Catalina on Mac

As the newest macOS 10.15 is available now, many users would love to test out the newest macOS immediately. Normally, you can sign up to the Apple APP Store to download and install the macOS Catalina 10.15 now. However, this brand new software could cause problems while you are downloading and installing it. Continue reading to know how to solve this problems right now.

If you are suffering from this problem, you probably need to check if you have enough space on the drive or volume for installation in that the update will take 4.9 GB in total. Space is enough but the macOS installation couldn't be completed still? Well, you can boot your Mac into Safe Mode and reinstall macOS 10.15, and here is how.

Restart your Mac and immediately hold the Shift button.
When your Mac boot into Safe Mode, reinstall macOS 10.15 Catalina.
Reboot your Mac.

Also, you may be unable to upgrade to macOS Catalina because of the error 'macOS Catalina could not be verified' below, even though you have cleared out your content caching and re-download for times.

How to fix:

Click the Apple logo at the upper left and choose System Preferences.
Find Date & Time and open it.
Select Date & Time panel and Click the lock to make changes at lower left.
Uncheck and then recheck the 'Set date and time automatically' option and then save changes by click the lock.

Then restart the computer and proceed to download the update once again through settings and software update. Hopefully, it will resolve the issue of the update not being verified.

3. macOS Catalina runs into low disk space during installation

Chances are that you still can't install macOS Catalina even in Safe Mode. Sometimes, even though you have pretty much no personal file on this Mac and space appears to be enough, you still could fail to install this system due to low disk space warning. As a matter of fact, it's just one of the macOS Catalina problems many users would face.

Some users see an additional Macintosh HD - Data volume in the Disk Utility of macOS Catalina and regard it as the culprit. Indeed, it's not. The truth is that APFS in macOS Catalina will divide your data into two volumes. One is called Macintosh HD which contains the system information and is protected with read-only mode, while the other one is Macintosh HD - Data volume where your apps and files are stored.

However, if you are disturbed by the low space problem, you received the low space warning from the system. According to some macOS developer geeks, it is because Apple didn't yet update the storage tab in 'About this Mac' to recognize the new file system layout in macOS Catalina.

Up to now, the available solution to fix low space issue is to delete some local Time Machine snapshots which were made by the system previously. However, if you are not a specialist, you are not advised to do this deletion in case of losing data. Instead, if you have backups in Time Machine, you can just downgrade the macOS Catalina to another stable one like Mojave and then restore your lost f

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