pretty sure they keep the core saved for each expansion on how it was before the next expansion
I dont get people who think that they don't have a freakin code of THEIR OWN game!!! Cmon ....
When you push a new version you don't delete the old ones. I don't understand that mentality as well. It's just data that you can keep stored, it's not like you need physical space to make room for all the branches.
Blizzard ft. Activision. https://static-cdn.jtvnw.net/emoticons/v1/4339/1.0