How do I uninstall macOS Catalina and revert back to the previous OS?

I installed macOS Catalina a few days ago and now I want to reinstall my previous OS. I think it was Mojave. Everything is backed up.

MacBook Air

Posted on Oct 16, 2020 09:26 PM

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dialabrain

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Posted on Oct 16, 2020 09:57 PM

Revert your Mac to a previous macOS version - Apple Support

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Revert from Catalina to Original OS (Yosemite) or can I just revert to Mojave iMac was recently updated to Catalina, and a piece of software that is used frequently does not work with Catalina, so we want to revert back from Catalina. The computer's original OS was Yosemite and may have been updated to El Capitan, but not further. We'd like to use a later OS, but just not Catalina. Is it possible to revert back to Mojave from Catalina, or does the computer have to be reverted back to the original OS and then updated to Mojave? The computer has been being backed up with Time Machine, but we could not restore from that because of an issue with file formats. So, now trying to figure out what we should do. Thanks.
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dialabrain

Level 10

133,469 points

Oct 16, 2020 09:57 PM in response to nancywex09

Revert your Mac to a previous macOS version - Apple Support

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How do I uninstall macOS Catalina and revert back to the previous OS?

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