There should be a "www" folder which has another folder in it named "save". If you copy that folder into the "www" folder of the new version of the game, you should find your old saves again!
That error might have something to do with a new plug-in I used for the new story quest. I had the same one when testing and could only go around it when starting a new game. I assume for this version, you would have to start over again... I'm really sorry.
