With any of the downgrade methods, you’re going to lose all the data currently on your Mac. Use Time Machine to restore from a date when your Mac was using a previous version of the o perating system.Reinstall a previous version of the Mac OS using the appropriate Mac OS Installer.
There are a few different ways to perform the downgrade here are two of them. What You Need in O rder to Downgrade from macOS Catalina With those caveats in mind, let’s start the downgrade process. If you’re downgrading because of macOS Catalina installation problems, be sure to check the Catalina Install Issues section near the end of this article for any special steps you may need to take. If you would like to downgrade from macOS Catalina to a previous version of the Mac operating system it can be done, but it isn’t always an easy or painless process.
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