Download the mod files from a trusted source like Nexus Mods or GameBanana.
Some users prefer a manual approach by editing the prototypeenginef.dll file using a tool like HxD. 52 41 44 5F 46 49 4E 41 4C 00 00 . prototype 2 debug menu
Note: This works on the latest Steam version as of 2024/2025. If the game updates, the memory address may shift. Download the mod files from a trusted source