Mod is published by RuslanchikX at NexusMods, you likely want to download from there: MGRR 2 Players Mode
This mod enables local multiplayer of Metal Gear Rising by spawning additional player entities through Frouk's plugin SDK and overriding their inputs to handle each controller separately.
Place the generated .asi file in your METAL GEAR RISING REVENGEANCE/scripts folder and use Ultimate ASI Loader or Rising Mod Manager to hook it. Then copy the rising_multiplayer folder from the source base directory to your GameData folder, this contains all assets for the custom UI
An additional ple010_us.dat file included on NexusMods fixes the voice soundbanks for DLC characters.
Install Frouk's plugin SDK and modify game/Pl0000.h to the updated version included in "sdk-changes" (which renames the player fields for key pressed and key held values). Launch the solution in Visual Studio and compile as "Release x86".