Well, I'm probably the 100th person saying this, but I'm having a problem with the key. I received it,downloaded it as .zip, then extracted the file and put it in my NWN folder, I downloaded the premium models re-installer and installed the Kingmaker, but it seems I can't use the Multiplayer yet. Am I doing something wrong? Let me know! Thanks.
(I'm using Windows 7 btw, if that has anything to do with this problem)


EDIT: It actually started working now -_- Sorry for bothering!

You would be more like the 10,000th person to ask. Or at least it feels that way.

Solution.
http://www.gog.com/en/support/neverwinter_nights_diamond_edition/online_play_in_neverwinter_nights_diamond