Do the CEP files go in their own file or somewhere specific in the neverwinter nights folder?
Each one goes in their own specific folder: Haks to haks, mods to mods, etc.
If memory serves, when you download the CEP, you will see folders. You will have to open up those folders and put those files contained in the folder in the correct NWN folder.
BTW, you may have to create a "tlk" folder in your NWN section and put the "tlk" file in there.
Good luck. If it's any consolation, a lot of people have had the same problems you're having. Just hang in there.