I just got my computer and downloaded all my games onto it, when I noticed something. I looked to see where I could download all my expansion packs, but only one was available for download, and it said I had to buy the rest. I'm afraid the product codes won't work again, considering I've tried this before and the codes were "already in use" so I don't know how to get my packs back, and I don't want to have to spend twenty dollars for things I already have. Please help. Thanks!