As stated before I’m not an Apple user, but If I look at what you mention and what’s been offered at the OSX link I posted before I think this one would be the best choice: macOS 10.14 x86_64 5.8 3046
That zip contains:
- INSTALL.readme.rtf
- RawTherapee_macOS_10.14_x86_64_5.8-3046-g5268b94cf.dmg
- rawtherapee-cli
This thread (especially this user) talks about using it with success on his MacOS 11 (Big Sur) machine. Guessing that MacOS 10.15 (Catalina) should work as well, this being a build for 10.14.