I don't really understand the question....
There is only one version of the game at any point in time, the current version. Any saves a player makes is deleted when you unpublish a game, so you can't save a game in the old version, and load it up in the new version.
What you CAN do is play the story, via your control panel, then get to the part the error is at, make the changes, then refresh the storygame page, and whatever change you made will affect the current game you are player.