Some great advice here from @Slak_Jaw from a previous post regarding problems like this and how to avoid them in future.
I’ll certainly be borrowing this workflow.
I don’t believe there is a way to rollback the software unfortunately. I always do a full system backup now on MacOS and iOS before updating to the latest djay version. I’ve been burned before so this is part of my workflow now. This way I can revert my system(s) back in case there are major issues. It’s a bit of a pain to do a full system recovery, but worth it if you need the software for work for an important gig.
Also I never do an update if I have a gig coming up. Best to wait and see what…