Download and install this v1.65 patch for Neverwinter Nights if the in-game "Update" button doesn't work. This patch includes several fixes to both the game and the Aurora Toolset.
Full Specifications
What's new in version
General
ReleaseNovember 7, 2008
Date AddedDecember 15, 2004
Operating Systems
Operating SystemsWindows 2000, Windows 98, Windows Me, Windows, Windows XP
Additional RequirementsWindows 98/Me/2000/XP, Neverwinter Nights retail version