The .dmg provided at RawTherapee.com was generated and notarized by me and has the following characteristics.
shasum -a 256 RawTherapee_macOS_11.7_Universal_5.9_folder/RawTherapee_macOS_11.7_Universal_5.9.dmg
725148bbcaed99d05aabd577fa46b24f6408cac0d9393a17778f077f8d0afa84
spctl -a -vvvv RawTherapee_macOS_11.7_Universal_5.9_folder/RawTherapee_macOS_11.7_Universal_5.9.dmg
RawTherapee_macOS_11.7_Universal_5.9_folder/RawTherapee_macOS_11.7_Universal_5.9.dmg: rejected (the code is valid but does not seem to be an app)
origin=Developer ID Application: Richard Barber (5SJ86G6Q2R)
No idea why it’s not posted there or when it will be updated there.