Even the Atari site is announcing the Sept. 23 release date

[Sandman]

Originally Posted by Bossman

Well, that didn't work. I also tried to download it couple times.

It's strange. Keeping default installation patch for the demo and updating DirectX solved this problem for polish players... Re-downloading won't help you, so don't waste your time for it.
You could also try to change the patch to drive C: if default one is different. There's a slight chance it will solve your problem.