Finding a physical copy of the original version may be your best bet. Just make sure you're able to return it if it doesn't work.
What Geneo said is true though. I have my original 360 save on the BT version and it's pretty much broken. It crashes constantly, sometimes making random things like horses vanish into thin air, other times the crash deletes the world completely, meaning I have to re-upload it. It might be easier to just start a new world.