As suggested above, using the torrent always works fine if you have a torrent program installed like uTorrent. The regular download requires you to log in after the ad to the site to validate you as a person with an account, if you just try to go to the download page without being signed in it will not let you download the game, make sure you are logged into the site.
If you still have issues it's heavily suggested to do what has been suggested above and download utorrent and then click the torrent link on the site and downloading that way.