I am still able to run it fine, with the Steam version...
If you're running any of the beta versions, I think I recall they don't include WSE. The latest 'stable' version includes the correct version of WSE.
So sad this mod is dead. IMO this mod is like, the base of what every other mod should be built on lol. It just adds a plethora of awesome features which I end up missing when I play other Warband mods.