Anyone on an iMac using Catalina do not upgrade to Photoshop 2021. It is not compatible.

[davida63066451]

Photoshop 2021 Not compatible with Catalina on an iMac. Do not upgrade!

[Ph8 Productions]

I concur, I've tried all the fixes reported to help and can't even get PS to open and stay open with any stability.  Crashes with our without doing anything.... WARNING!