Hey just thought I’d mention for folks that already updated to Big Sur and want to use overbridge that it’s now very easy with apfs to have multiple macOS versions running on a machine. You could install Catalina or if you install Mojave you’d have a partition that still can run 32bit apps as well…
Edit: I should add to do your own research first and make a backup, proceed at your own risk, etc…
I have been researching a Mojave/Catalina dual boot and that seems to work OK but I have read about some issues using Big Sur and older OS’s… Perhaps they were jist with Big Sur beta and are resolved with the latter updates, I’m not sure… I figured since its an apple support doc it would be safe to post but I don’t know for sure…