You can find your saves in /(WhateverIsYouHeadmasterFolder)/game/saves. First number in the name of the file is page, second is slot of the save. That being said, you don't need to do anything specific – update doesn't delete your saves.
As for the second part... Idunno. Don't remember, rather. Rule of thumb is to try and clear other quests in hope it'll unlock the path or something, but other than that I can't help.