I ran into exactly the same issue trying to install an update to Acrobat 10. Contact with Adobe indicated it was a problem caused by a previous update and there were references to the problem in their forums. Adobes recommended solution was to reinstall Acrobat from the original CD or DMG and then run the update. Worked like a champ!


If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein