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 people are reporting on this forum first. Another thing you can consider if you have multiple devices, is to update djay on only one and give it a thorough testing first before updating you main device. I’ve done this before by running the update on my iPhone before updating it on my Mac or iPad. Be warned that this doesn’t always work though because I have had bugs that were isolated to one device.
Innovation comes with risks. For me the bugs in this release are manageable and the new features are fantastic, but I also don’t have a gig this weekend…