I had a similar problem, so was delighted to find these instructions. The download worked just fine, but I encountered a different problem. I downloaded Acrobat 9 Standard and ran the installation; however, when I entered the serial number (copied from the "My Products and Services" page), I still got an Invalid Serial Number error message. On an earlier call to Customer Support, I was told that this serial number indicated that I had originally installed from a DVD; would that cause an Invalid Serial Number message when I entered in this installation wizard? Would it make a difference if I burned the install files to a DVD and ran them from there? I may still have the original DVD, buried in one of several moving boxes in my basement. I was just hoping to avoid that scavenger hunt.
Thanks for any help you can offer.