i only have nacht der untoten, never bought a single dlc for this game, and don't plan to. and i have tried tactical, but you see the screen containing the options wont even come up, nothing happens at all, just basic zombies..., for all i know, the files did nothing at all to the game, i don't even get that menu he had up on the video, so clearly something is wrong. what am i doing wrong...?:'(