> sorry I missed your comment.
No problem
> I hope that answers your question?
Not really...
I'm not a native English speaker, but if you say that each part is a separate game and therefore I have to create multiple physical folders for each part, even though, according to your statement, I can import the save game from 1 & 2 into 3, then that doesn't make sense to me...
All games of this type that I've encountered so far are extracted to the same folder when a sequel (a new chapter) is released. From there, you can simply access the last save and play the update.
It seems to be different here. Unfortunately, you haven't answered exactly how or why these are three independent games with the same name.