Warning with the steam version:

[Morderon]

https://steamcommunity.com/games/704450 ... 1040663050

The current patch versions are different between beamdog and steam.

To launch the steam version without updating you can go to your steam install location to run the game without performing an update.

Mine as an example:

\Program Files\Steam\steamapps\common\Neverwinter Nights\bin\win32

(Read the following warning before doing) You can also easily reach you NWN install directory from steam by right clicking the game in your libary, click properties, Local Files tab, and click browse local files.

Warning: If you don't have 'update this game only when it starts' or another way to limit steam downloads, this will force the update.