After nearly four months of beta, Apple released the 16th version of its UNIX-based Mac operating system on the evening of October 7, 2019. macOS 10.15 Catalina is putting an end to iTunes and splitting its features into three new apps, and the Finder. In addition, the screen time is known from iOS is coming to the Mac, with Project Catalyst you can now easily create programs for iOS, iPad, and Mac, many new applications that previously only existed for iOS will come to the Mac App Store.
macOS 10.15 Catalina is already so stable in the current version that the installation is recommended: The new system can be installed easily and easily via the App Store, you will also be prompted to do so via the software update system setting.
However, Catalina has a catch: 32-bit software no longer runs the system, those who still use old software or unsupported printers or scanners will have to stay on Mojave — but can use Catalina on their own partition. Even in the beta phase, many testers prefer to install macOS 10.15 not on their production system, but on a separate partition or external media. If you use a Mac with High Sierra or Mojave with the new APFS file system, this is no longer necessary — and is no longer recommended by Apple.
Reinstall macOS Catalina.
Please note: If you reinstall macOS Catalina, only the operating system will be updated – no files on the hard disk will be touched, no user files, or even settings. This distinguishes a normal new installation fundamentally from a clean new installation, in which all data is deleted.
Here are the steps to reinstall macOS Catalina.
1. Back up your Mac first.
Before making any major changes to how your Mac works, it is always a good idea to make a backup. Before you tackle a difficult challenge in a computer game, save for security. Backups are very similar: you can go back to this state, whatever happens.
There are many good backup solutions on the market for a wide range of requirements. If you don’t have time to search for a specific one, a useful option is also included in your Mac’s operating system — Time Machine.
How to use Time Machine:
- Connect an external hard drive to the Mac via USB or WLAN.
- Go to “System Settings” ➙ “Time Machine.”
- Click on “Select backup volume ….”
- Click, “Use Volume.”
2. Clear junk from your Mac to speed it up.
There’s nothing like a brand-new Mac with a brand new macOS. If only the latter is really new, it won’t feel that great. Getting everything out of macOS Catalina on an older computer can be a challenge. But don’t rush to the nearest Apple Store right away — there are still options.
Just likes dust behind the sofa or on the kitchen cupboards, small remnants of system files, caches, and hidden media libraries can accumulate on the Mac without ever being deleted, which slows down the computer at some point in its everyday tasks. While you can track down and remove part of it yourself, some data garbage requires some specialist knowledge and deleting it can take a while.
Luckily, there is a professional program to do this automatically done — CleanMyMac X. Optimizing the Mac behind the scenes is straightforward with one click with CleanMyMac X:
- Download the free trial version of CleanMyMac X.
- Open the app and navigate to “System Remnants” in the left sidebar.
- Click, “Scan” and wait for the process to finish.
- Then click on “Check items.”
- Deselect everything you want to keep and click, “Clean.”
This freed your Mac from all the log files, user cache files, language files, old update files, and more that are no longer required. This immediately translates into higher computing power and more free memory, and the system reacts more smoothly overall. Finally, your Mac can fully utilize the potential of macOS Catalina.
3. Reinstall macOS Catalina in recovery mode.
Now that your Mac is in top shape, you can download macOS Catalina. Surprisingly, this is neither offered under “Software update” nor in the App Store (as was still the case with macOS High Sierra).
Put Mac in recovery mode to correctly reset macOS Catalina:
- Restart the Mac, then hold down ⌘ + R to activate recovery mode.
- In the first window, select “Reinstall macOS” ➙ “Continue.”
- Select the hard drive on which you want to reinstall macOS Catalina and click “Install.”
The new installation starts after a short time and takes about 30 minutes. When the process is complete, the Mac starts as usual. No files should have been deleted, but it is always advisable to use the “Software Update” module from CleanMyMac X to check whether the compatibility of the new macOS with the installed apps can be optimized:
- Start CleanMyMac X.
- Navigate to “Updater” in the left sidebar.
- Check all available updates, and the related details, and click on “Update.”
If files or apps are missing or settings have been reset, you can open Time Machine and restore a specific folder or the entire backup from step 1:
- Start Time Machine in the “Applications” folder.
- Search all versions of the backup for the desired file.
- Click on “Restore.”
If you choose to restore the entire backup, you will need to repeat the entire process of optimizing your Mac and reinstalling macOS Catalina as described above. Fortunately, the new installation works wonders in most cases the first time you try it.