Unfortunately, it’s the Diamond Edition, which is problematic to install in Linux. There’s an older Linux install guide for the original retail release of Diamond, but I don’t know how much of it still applies (I can’t test as I’ve had NWN since the original pre-expansion pack release). Anyone willing to take a chance and see?
There are also two contests running until November 24, to celebrate the release of Neverwinter Nights:
The game provides players with very an useful and extensive set of tools to create their own quests and adventures. We encourage gamers to create a NWN module entitled “The DRM Monster and the Treasure of GOG” :). For those of you who are skilled enough, we encourage you to take part in the second contest where you have to create a model of the evil DRM monster. From all entries we will reward the authors of the 5 best quests and the author of the best model of the DRM monster with free GOG games, plus we’ll post a special mod spotlight highlighting the winning entries.