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Level 1

5 points

how do I go from Catalina 10.15.7 to High Sierra on an iMac Late 2012

My iMac doesn't run well on Catalina. How do I go back from Catalina 10.15.7 to High Sierra on an iMac Late 2012?

iMac 21.5″, macOS 10.15

Posted on Jun 6, 2022 5:50 AM

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Level 8

39,765 points

Posted on Jun 6, 2022 5:55 AM

Make a time machine backup
How to get old versions of macOS - Apple Support (CA) download high Sierra here
How to create a bootable installer for macOS - Apple Support (CA) make a bootable installer with high sierra
Boot from the usb (hold the option/alt key during startup end select the disk that is called install high sierra
Install High Sierra
Migrate your data back from the backup

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