How are you trying to download the upgrade? Using the internal Adobe updater program or downloading the update from the Adobe website?
Even I have the same problem. I tried to download it from the Adobe Website. Could you please suggest a solution for this?
Originally, I was at the local city goverment site. The file I was trying to download was a schedule of children's summer activities for my grandchildren. I got a message that I needed to update my Adobe Reader in order to view the schedule. After I had waited for the download, at about 96% completion, an install wizard activated. I clicked continue and then the error message popped up.
I have since (yesterday) downloaded the program from the Adobe website, however the results are exactly the same. My computer seems to think I have all the information but I immediately get an internal message error when I try to initiate the Reader.
I am using Vista O/S if that makes a difference.