The game will restart with your mod loaded, you can unload it in the same way if you want. Method 1 : Standalone mods won't affect the game Campaign unless they're enabled, Drag and drop their folder to the Main game Folder, Open the game and select Options>Expansions and Check your mod and accept changes. Simply drag and drop your pdo mods to the Addons folder inside 'ARMA 3' Folder and run the game. Loading Mods as a part of the base gameġ - Loading Mods as a part of the base game.