A thing that I do to never have issues with CD-Key is to have a backup of the file nwncdkey.ini located on the root of your nwn folder.
It have all the CD Keys. You can also just open that file with notepad and copy it to a piece of paper or send an email to yourself with just the numbers.
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Wilfire Strongfeet (Tight pants)
Adela Griffonheart (Poke)
Hallvardr Erikson (Sexy Boy)
Emilly MacMillan (Happy)
Sprites by Raua!