Info and Download for RTCW Mod: https://www.moddb.com/games/return-to-castle-wolfenstein/addons/rtcw-enhanced-reshade
Another version for RTCW and RealRTCW: https://www.moddb.com/mods/realrtcw-realism-mod/addons/reshadelite-realrtcw
Download Program: https://reshade.me/
Tutorial to Install: https://www.youtube.com/watch?v=u5HGXJYB4J4