Try downloading the game with torrent instead.
Usually it should just be to click the download link and then choose "Save as" if you use IE, or just save it directly in something like Firefox.
But if it doesn't work I'm not sure what you're doing though.
Since it's the download itself I'd suggest you to get a torrent program like utorrent(<google it). Then go to the download page after you installed it, and press the "torrent" links for both the patch and the game itself.
Download them both, and run the game installer once it's complete, and then run the patch installer once it's complete.