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
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- 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