Summary: This article discusses all macOS Catalina known issues with solutions. Issues like hardware or apps won't work after macOS Catalina update, Mac not turning on, and data loss are included.

Many people are indecisive to upgrade to macOS Catalina, the latest operating system by Apple. Thus, knowing possible macOS Catalina issues will help a lot before you install macOS 10.15. 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.

Note: this is a wiki article Working: 1Password 7.3.0 4D 17.2 Hot Fix 1 Ableton Live 10 Lite Adapter AdGuard for Safari (2.0.4.552) AdGuard for Mac Adobe After Effects CC 2019 (16.1.1) Adobe Audition Adobe Illustrator 2019 Adobe Lightroom Classic CC 2019 (8.2 & 8.3) Adobe Photoshop 2019 Adobe. There is a rare case where Mac's running macOS Catalina may not be able to access the internet after disconnecting from IPVanish after an attempted macOS update while connected to IPVanish VPN. Internet connectivity appears to stop working as described in the scenario above because the IPVanish DNS servers are not removed properly when you.

Therefore, this post discusses some common macOS Catalina upgrade issues and 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 update My Mac to macOS 10.15 Catalina?; 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. macOS Catalina keeps asking for Apple ID; 10. Apps icons go missing in the Finder; 11. WiFi/Bluetooth is not working on macOS Catalina; 12. iCloud is not available after macOS update; 13. External hard drives/mouse/keyboard is not working in macOS Catalina; 14. macOS Catalina makes Mac slow/overheating; 15. Files, documents, or folders get lost after update; 16. 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 Data Recovery for Mac first.

With more patchers are released and bugs are fixed, macOS 10.15 Catalina becomes better and better. But new macOS Catalina issues will never stop showing up. Thus, this article is worthy of reading as you'll know some common macOS Catalina upgrade issues, and how to address them.

1. Should I update My Mac to macOS 10.15 Catalina?

macOS Catalina is so tempting to upgrade, but you may still sit on the fence and wonder:

Is macOS Catalina stable to use on My Mac?
Is it worth updating to macOS Catalina?
Will macOS Catalina damage or slow down My Mac?

More worries keep bothering you. Then, should you upgrade to macOS 10.15 Catalina on your Mac? To be honest, it's up to you as now macOS Catalina is getting less and less flaws.

If you want to try these new features mentioned in WWDC 2019, you can have a bash to install macOS Catalina. But keep one thing in mind, back up your Mac and everything before updating macOS.

If you are an conservative person who have get used to macOS Mojave or High Sierra, then just don't upgrade.

2. Can't install macOS Catalina on Mac

Normally, you can sign up to the Apple APP Store to download and install the macOS Catalina 10.15. But you could encounter problems while you are downloading or installing it.

How to fix:

If you are suffering from this problem, you probably need to check if you have enough space on the drive or volume for installation. The macOS Catalina update will take more than 4.9 GB in total.

Or you may not install to this volume because the Macintosh HD is not mounted when installing macOS Catalina, then you need to check your startup disk in Disk Utility.

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. This will isolate incompatible software when you update the sysem. Here is how to boot Mac in Safe Mode (also known as Single User mode).

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.

However, if you are disturbed by the low space problem, you received the low space warning from the system.

How to Fix:

You can fix the 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 files.

Some users see an additional Macintosh HD - Data volume in the Disk Utility of macOS Catalina and regard it as an unknown issue. Indeed, it's not. APFS drive in macOS Catalina will be divided 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.

4. Can I install the macOS 10.15 alongside macOS Mojave?

You are torn if you don't know if macOS Catalina is better than Mojave or High Sierra. Maybe, you can make a compromise between them. That is to run macOS Catalina alongside your current macOS.

You can split your hard drive into two systems and install the Catalina on a separate partition. It is feasible because macOS Catalina will reside itself in a read-only volume, and you can do this with these steps:

Step 1: Open Finder and click Go at the upper left of your desktop.

Step 2: Go to Utilities and choose Disk Utility.

Step 3: Select the internal/startup hard disk and choose Partition at the top.

Step 4: Click Partition and click on the plus button +.

Step 5: Fill in a name, choose APFS format, and choose a size.

Step 6: Click Apply to create a new partition.

Step 7: When you move forward to install macOS Catalina, choose this partition as the installation location.

To switch between your current macOS Mojave and macOS Catalina, you can access System Preferences by clicking the Apple logo at the upper left of the desktop and select Startup Disk. Then click the lock at the lower left corner to make changes, key in the password as the system asks. Finally, select your system and restart your Mac.

5. Mac won't boot/turn on after installing macOS Catalina

If you breeze in the newest macOS and install it to your lovely Mac computer, only to find that your Mac won't turn on or stuck on the loading bar after update, or even gets stuck on Mac grey or white screen.

What a nuisance! It has to be fixed instantly because you probably are in need of this Mac. But before you go f

Apps Not Working And Mac Slow After Catalina Upgrade