Unfortunately, the old stable build is not 8181 anymore. I will post a zip to downgrade to it, but for now, get NWN Diamond: https://sinfar.net/getting_started/how_to_play/using_nwn_diamond

Download it: sinfarx_ee.exe
and put it in your win32 folder, next to nwmain.exe. For example: C:\SteamLibrary\steamapps\common\Neverwinter Nights\bin\win32

The easiest way is to subscribe to the workshop.
Alternatively and for non-steam users, you can download them manually: sinfar_all_files_v27.exe
And extract them in your “C:\Users\username\Documents\Neverwinter Nights” folder.
And here's more download options: https://sinfar.net/haks



Done! Go back to the How to Play page.