If you're able to download the game, the simplest thing to do is to just install Impulse, register your key, and download the entire latest version of the game. If downloading ~2GB is not possible for you though, please contact [email protected] and they can look into the disc install issue.

Anyone with a retail copy can still download the whole game at any time (it's the same process as you'd use to get the patches). As above, it's a simple matter of registering the serial key and using Impulse.