CRITICAL FILES! This pack includes all the modules that The Umbral Abyss uses. Extract them all to your "modules" folder at: C:\Documents and Settings\YOUR_LOGIN_NAME\My Documents\Neverwinter Nights 2\
You should have 7 module folders in your modules folder: UA1, UA2, UA2_DALE, UA2_MIRKWOOD, UA2_EREBOR, UA2_BLACKBLOOD and UA3.