The mod uses 'Reshade Ultimate and SweetFX (?)' however when i boot the game it shows some white text showing the shaders have been successfully loaded but other than that - just a black screen. Without reshade it works fine.
I also found a reshade profile for Quake 4 under presets on this site - had the same problem.
Moving the mouse around I can hear it interacting with menu's - alt tabbing you see the actual screen flicker then it returns to black.