Any version of NWN1 obtained after 2003 (Hordes of the Underdark) can be made compatible with Sinfar but you will have to apply multiple patches and then you will hardly know if you done things right. So it is recommended that you proceed with the Starting from Scratch steps, even if you have an installation that appears to be working.
If you have any issue, we can help you on Discord: https://discord.gg/jVaNBmj
This is where you will extract all the installation files.
NWN Diamond installation is portable so you can put it anywhere, even on a USB key.
The only file that matters from your previous installation is this nwncdkey.ini file. You can Find it at one of the following locations:
[CDKEY] Key1=XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Key2=XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Key3=XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
Then replace the “XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX-XXXXX” by your keys, where:
Key1 = Neverwinter Nights Key
Key2 = Shadows of Undrentide Key
Key3 = Hordes of the Underdark Key
Both NWNDiamondData.exe and sinfar_all_files_v27.exe are self-extracting archive, so you can extract with with 7-zip or run them, starting with NWNDiamondData.exe:
To launch the game, you need to run sinfarx.exe:
For the next steps, go back to How to Play
If you want to use your own custom NWN installation, then you will at least need those Sinfar-specific files:
NWN Diamond works well on Linux too, instructions are here: NWN Diamond on Linux