Neverwinter 2 Storm Lan Serial Another Question Concerning Neverwinter Nights 2...?

Another question concerning Neverwinter Nights 2...? - neverwinter 2 storm lan serial

What should be done to give the expansion packs?
1.Mask is the traitor 2.Storm 3.Mysteries Zehir of Westgate?

So why not Westgate secrets of the obsidian?

You can have your own party?

Please respond.