The NWN Vault is certainly where you want to go. Be sure to pay careful attention to the description, it'll tell you what is required to play the module (i.e. SoU, HotU, CEP, etc.). The main module file (.mod) goes in the modules directory of your NWN folder. There may also be hack Packs (.hak) which go in your hak directory. Likewise, .bmu in the music directory, .bik in the mov