*Update for newcomers*
WSGF Hacks for KOTOR page has been updated with instructions for the Steam version of the game.
----
Yup as I guessed when I first saw the game on Steam, looks like whatever they did to modify the game's executable for Steam changed it enough that the appropriate hex strings UniWS needs to modify can not be found.
Following the manual hex editing guide we have were won't work since that relies on the same hex strings as UniWS.
Someone with appropriate compiled code reading knowledge might be able to relocate the hex strings that need to be modified - and then we can simply update UniWS with a separate entry for the Steam version of the game.
If I end up getting the game on Steam, I'll try my best. I can't make any promises though as my hex reading abilities are fairly basic, and I'm not sure when I'll get around to having the time to do the research.