Playing on Sinfar requires NWN including both its expansions, Shadows of Undrentide and Hordes of the Underdark. Today, these come bundled in NWN Diamond Edition available in CD Format from Amazon or Ebay or if you purchase a copy of NWN Enhanced Edition from GOG.com (the latter is highly recommended in this case).
If you have any issue, we can help you on Discord: https://discord.gg/jVaNBmj
Once the game is installed and working normally, you have to download the following files for Sinfar to work properly:
To launch the game, you need to run sinfarx.exe:
For the next steps, go back to PAGE INFO ALREADY TRANSFERRED TO THE NEW WIKI - How to Play
NWN Diamond works well on Linux too, instructions are here: PAGE INFO ALREADY TRANSFERRED TO THE NEW WIKI - NWN Diamond on Linux