anybody ever play these games at www.ratbaggames.com

I downloaded the leadfoot demo and then it stopped playing becasue it said that this has expired so contact ratbag for updates. so I went and bought the game and deleted the other one. all the registry stuff that went with it as well. Then I put the cd in and installed the full version, well I get the same error. as before. did I miss soemthing inthe registry or did I get ripped off?