In the original RG repack, a certain script node in the "UFE (Ultimate Fighting Experience)" chapter would never advance. The patched version replaces three .lua scripting files from the original game disc images, restoring the event flags.
If you already have a file named maxpayne3repackrgmechanics but aren't sure if it's the patched build, perform these three checks: maxpayne3repackrgmechanics patched
If you have the RG Mechanics files but the game won't launch, you likely don't need to re-download the whole game. You just need to "patch" the environment: In the original RG repack, a certain script