Bioware has released a new patch for Neverwinter Nights which updates the game to version 1.19. Bioware recommends that you update the game by selecting 'Update' from the Neverwinter Nights game launcher.

Here are the fixes in this patch:

Creatures will now use their spell-like abilities again
Bards will no longer become illegal characters
Sort community names alphabetically in chat
Neverwinter Nights now works with DirectX debug DLLs
Added a Tech Support chat area

But if you want to manually install the patch hit read more.

Download Neverwinter Nights v1.19 English