I am in need of a CD key.
Please use the Support form to request CD keys. We will add NWN to our automated system as soon as we can, but in the meantime Support is the only way to get a key.
You need to go here: http://www.gog.com/en/support/neverwinter_nights_diamond_edition
And click the "I can't find solution (...)" link on the right. That will get you to the right form.
Since this thread is being misinterpreted so many times, can we perhaps just lock the thread? With the correct information in the last post.