Hi! I have all EPs and SPs installed. From what I understand, you'll need at least all EPs (it's a hit and miss sometimes because of some coding present in earlier EPs that were later introduced in other EPs too, like the staging I used), but you might not need the SPs. I've been told that if I used an object introduced in an SP you don't have, it will just not show up (as opposed of crashing your entire game).