Try starting a new game and save it.
Call the save file TEST.
Go back into DD and load the TEST save file to check it works okay.
Then close down DD.
Then copy your old cd version save into the TEST save folder that has been created.
Now try opening the TEST save file in game.
It should now have your old save loaded.
If that doesn't work I suspect that save files from the downloaded version and the cd retail version are not interchangeable.
