How to fix macOS 10.15 Catalina problems

Either way, an up to date Mac not only is a good quick fix but it also eliminates old software from your troubleshooting steps. I was recently experiencing some heavy crashing on an OS X 10.7.4 Mac. For some reason, any time I would try to use Quick Look, the Finder would crash. If there is an opportunity to connect your Mac online, you really can attempt Internet Recovery. Just as its name shows, you need to get your Mac online. Here is how to use Internet Recovery. Reboot Mac and tap 'Option' 'Command+R' when you hear the startup music. Keep the keys until you see a globe photo and progress bar.

Hello, thrill seekers. Looks like you’ve installed macOS Catalina knowing it’s not perfect and despite all warnings ended up here. You are not alone. We’ve rummaged through the internet and collected all macOS Catalina issues known to date. And boy, there’s a lot of wrongs to fix.

1. Can’t install macOS Catalina

You’ve unpacked the installer and now macOS Catalina install stuck on the initial reboot. All you can see is a black screen and even a hard reboot doesn’t help it. Though it’s perfectly normal for an installation to take some time (sometimes up to 10 hours), you can try a few workarounds.

Install Catalina in the Safe Mode

Press and hold down the Power key to shut down your computer.
Now, hold down Shift while it’s booting up.
You will see the Apple logo on a grayish background with a progress bar. After you entered the Safe mode, run the Catalina installer again. Hopefully, it reaches completion this time.

Tip: Press Command + L in the middle of the macOS installation. You will see if it’s still active and the remaining time before completion.

Do a PRAM and SMC Reset

It’s one of those last-ditch solutions that restore deep system settings including kernel information. It isn’t something you should be doing regularly but in our case, it’s worth trying.

How to reset PRAM
1.Shut down your computer
2. Press the Power key
3. Immediately press Command + Option + P + R keys
4. Hold down the keys until your Mac reboots
5. Let go of the keys

To reset SMC

1. Turn off your Mac
2. Hold down Control + Shift + Option and press power
3. Hold the buttons for 10-15 sec
4. Release the keys and restart your Mac
After you’re done, repeat macOS Catalina installation from scratch.

Mac Photos Has Attempted To Repair The Library Window

Free up space on your drive

macOS Catalina takes up about 30 GB on your drive. That’s unprecedented in macOS history. When you see the 'macOS Catalina cannot be installed on Macintosh HD' message, this sometimes means that there is not enough disk space for the new macOS. Therefore, you need to free up some space on your Mac.
How to free up space? Move your largest files onto an external drive — will take you about 20 minutes. Or if it looks like too much fuss, free up your storage with CleanMyMac X. It’s a tool that is actually notarized by Apple (shouldn’t be confused with MacKeeper).

You’ll easily remove 7-10 GBs of system garbage. Then you can install macOS Catalina on a drive that’s clean and refreshed.

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Mac photos has attempted to repair the library code

Catalina installation stuck on “Setting up your Mac” screen

So your installation has started but seems to be stuck on the initial screen. What can you do? If your patience has finally run out, it’s time for a mission abort.

Press the power button and wait till your Mac reboots.
Start the installation all over again — this time it should go fine.

“macOS Catalina could not be verified”

This error usually appears when the download has finished. Apparently, it has something to do with cached content associated with your user account.

Open System Preferences > Sharing > Content caching
Switch to “All content`’ in the dropdown menu

The first attempt to download Catalina would often return the same error. But don’t give up just yet! Try downloading Catalina once again — this time it will download it from the cached copy on your Mac which will take about 10-15 seconds. Now it should be ok.

If it doesn’t help you can also:

Simply restart your Mac
Download Catalina under different “user” on your Mac
Try to delete system cache with CleanMyMac

2. macOS Catalina freezing upon reboot

The situation looks like this: macOS Catalina has completed the install, and after you restart your Mac it is stuck on login screen. You see the progress bar but it isn’t going anywhere. What to do?
As one user pointed out, the problem may be caused by 3d party kernel extensions or kexts. They act as drivers — if you like a Windows analogy — and give access to your Mac’s hardware.

Solution: Move Library Extensions

As a band-aid solution, you can relocate your /Library/Extensions kexts to a backup folder. As confirmed by many users, this fixes macOS Catalina stuck on reboot problem.
To perform this, you will need Terminal app:
Click Launchpad > Terminal
Now paste in the following command:

mkdir ~/Extensions-Backup && sudo mv /Library/Extensions/* ~/Extensions-Backup/

This command relocates your Library Extensions to the username/Extensions Backup folder. Later you can put the Extensions back where they belong at: /Library/Extensions.

One more solution to macOS Catalina freezing

Generally, Macs freeze when some process is hogging the memory. Some background plugin could be eating up all the available RAM. Here is the method I use to identify my background memory-hoggers.
To get a clear idea what it is, I use CleanMyMac X’s Speed utility.
You need to install CleanMyMac X — it’s available as a free version too.
Open the app, click “Optimization.”

This will give you an idea what Launch Agents are working in the background so you can isolate and disable them.

PS. Heavy consumers — this tab reveals processes that are critically memory-demanding.

3. macOS Catalina apps not working

This is one of the macOS Catalina problems that trails back to macOS Mojave. As you’ve probably heard, app architecture knows 2 types: 32-bit and 64-bit. The 32-bit apps will not be supported on macOS Catalina, period. Sadly, they are not just some lo-fi indie apps, we are talking Photoshop!

Did you know:Apple states that 64-bit apps use memory more effectively and so will work faster on your Mac.

Check your 32-bit apps

There’s a quick way to count your potentially problematic applications.

Click the Apple logo > About this Mac > System report
Now find Applications in the sidebar.

To have a deeper look into your apps, where they come from, and how much space they are taking, run the Uninstaller tool in CleanMyMac X. Download this program here — it’s free to download.
Launch the app and click the Uninstaller tab

Here you can see your 32-bit apps and sort apps by “Last used.”

For example, I found a 32-bit video editor, which I didn’t realize was the