ummm, it says the "Gamemode_something_whatever_o r_something" file is missing. I can't remember the entire thing so I filled it in with somethings, whatevers, ors, and somethings.Like this guy had:I'm on OSX 10.6.8 and running on Steam.Edit: Solution: Duplicate the zip, remove copy and replace it with a space, extract it, remove the space on the folder, launch the game. There's probably a simpler way, but that's exactly what I ended up doing. You will see 3 of the xmas gamemodes in your thing, but at least they work!