@elucidic plutonium freshly installed or the game? they are two different things. Plutonium is just the launcher, it does not contain the game files. It makes your existing game safer to play online and adds tons of cool features and improvements. But you still need a copy of the game for this to work. Assuming you used the default location when you installed the game, it would be Program Files(x86)/steam/steamapps/common/Call of Duty - Black Ops II