I am trying to install an upgrade from Acrobat 11 Standard to Acrobat 11 Pro. I have purchased and upgrade license. When I try to install the Pro upgrade, I get a message that a product with higher functions is already installed and it terminates the install. Does anyone have any suggestions?
I would recommend you uninstall Std, run http://labs.adobe.com/downloads/acrobatcleaner.html, remove any left over Acrobat folder parts (in Program Files>Adobe), reboot, and install. You will likely have to give the S/N for Std as the qualifying product for XI Pro.