Sorry, but as written in the license you agreed to when you installed the game:

Thanks for the quick reply. I love the game and have recommended it to many people. I was a little disappointed when i found out that I could not just buy the expansion but had to buy the gold edition in order to get a box and instructions. Now I have the original game that is not really any good to me. I was hoping to give it to a friend so he could try it out. Anyways I think you guys rock and appreciate the way you update and continue to add new content. Keep up the good work.