@Blue-Eternal in the .zip file there will be a folder called "thundergun_in_all_maps" then go to your plutonium directory, then go to the folder called "storage", then go to "t5" and then create a folder called "mods". drag the folder from the .zip into there and load the mod through "mods" in the main menu. if you're not playing on plutonium go to your bo1 directory, create a folder called "mods" and put the folder from the zip in there (you'll need the linker mod to play through the steam version of bo1)