Having upgraded OBS before on macOS, I backed it up first, then installed the new version. As somewhat expected to me, the new version is not launching. I had to launch it from CLI to see and see there is an error: error: os_dlopen(libpython3.9.dylib->libpython3.9.dylib): dlopen(libpython3.9.dylib, 257): image not found It also changes something in the stored state on disk so that next time you try to launch an older…
Installing 3.9 from python.org might fix this. I can't see which other version they would build against but not include in the install.