Radiant Photo is an M1/M2 native software, which means that it is designed to run optimally on the new Apple processors, providing faster and more efficient performance.
However, Radiant Manager is an Intel app that requires Rosetta 2.
To activate Radiant Photo, it is necessary to have Radiant Manager installed on your device.
To do this, you will need to install Rosetta 2. You can learn more about it here: https://support.apple.com/en-us/HT211861