I want to restore my computer to an older version of MAC OS how do I do that?
How do I restore my computer to an older date that does not use current operating system
iMac with Retina 5K display, macOS 10.15
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If you want to downgrade your OS Catalina, the easiest way would be from your Time Machine backup:
Restore your Mac from a backup - Apple Support
If you don't have a TM backup or a clone, then you'll need to wipe to the disk and re-install. That can be arduous.
If you want to do this because of issues in Catalina, let us know what the problem is and we may be able to help.