Earlier, you said it wasn't in a zip folder. Did you already extract it, or do you not own 7zip? If you don't, you need to install 7zip in order to download the game's content properly.
Hmm. Strange. It's difficult for me to figure out what's going on without seeing a step-by-step, but I think you kind of did already. I just don't think it's enough. I'll have to look into it more.
