Lemur, I don't know how far along you are in the game but I would recommend you buying directly from LDW.

I bought the original VV from Pogo through Oberon Games. Fortunately, I never had any problems. From my time here on the boards, I learned how prompt and helpful the LDW staff are. If you have technical issues or even how to play issues; they are there for you and the forum community is the best group of people I have ever encountered.

There might be a way to back up your game (not sure since it is a demo) but you'll find out soon enough because someone will be on to let you know what would be the best way to purchase.

Good luck.