Cerebus 1960

Hi chaps, I am probably being stupid but I've only just bought the Battle Pack and I can't figure out what the hell I am supposed to do now. I have downloaded the zip file and unzipped it to find the readme and the great swan zip which I then unzipped to. As instructed I ran the activation file pasted the key and it said everything was ok. When I run the game I now have the new logo at the bottom showing the vehicle pack is activated, but Amiens Tonight and all the BP1 battles are all still greyed out. I assume all the Great Swan files need to be poked in somewhere, but where? and I can see all the game files are already there, so why can't the game see them? HELP!!!! Tom