Pff, I remember I've heard about this problem before, and someone I knew had it. There was a problem with unzipping the files then, but I wouldn't know anymore exactly. I've been looking here if I could find a topic describing the same problem as yours, but it seems I can't. It might be a good idea to post about it there, since Michael seems to linger around those forums quite a lot more to help people out.
Wish I could help you otherwise D8