ToME: the Tales of Maj'Eyal

Hi,
I log in using Steam & I've noticed that the Stone Wardens add on is missing.
Apparently there should be a file under game/addons called tome-stone-wardens.teaa?
Any idea where how I can get it back or where I can download it? I've tried the steam verify local files option.
TIA, Julian

Ah hang on - just read this:

>> Imported Stone Wardens class into the base game, with an unlock

I guess that's it. Sorry!