Update kills camera apps?
Just updated to Catalina and now all my photo apps are no available to work because they are no 64 bit? Really why would apple make it so we can no longer use the camera on a computer we paid top dollar for?
Which Apps can't use the Camera?
Do you have a Time Machine backup to Restore to/from?
https://support.apple.com/guide/mac-help/revert-to-a-previous-macos-version-mh15216/mac