Just a gentle reminder,..
OSX Catalina has been released today and it is 64 bit only.
If you are using any older software which has not been updated to 64 bit, it will no longer run (correctly? at all?) in Catalina.
For example, Pro Tools has not been updated and even though Reaper is 64 bit, the plug in it uses to convert flac files is not (or at least the last time I checked it wasn't).
In an earlier post I linked a free app that will check your system for compliance so if you haven't checked, that's a painless way to check.
Myself, I have several mission critical apps that won't.