I've already e-mailed you for an activation code, but there were a couple of things I just wanted to mention or reiterate incase other people had similar problems.
I managed to download the game fine and installed it with no problems. When I tried to start the game, I got an access violation error (sorry, I didn't note what it was). I closed it all down, tried to start it up again and this time the start screen loaded. However, I only have the option to play the demo or purchase the game. When I click on 'I've already purchased this' it comes up with an error 'Missing one or more tags'. Straaange.
A similar thing happened with Episode 2. I have a feeling it has something to do with the firewall (McAfee), as a pop-up comes up from it asking me whether I want to grant something access or not.