Also when I initially try to run the XI Pro and it tries validating the serial number the response is "serial number you provided is valid,, but a qualifying product could not be found.
listed under my products is adobe adobe acrobat professional.
As you've purchased an upgrade, when you enter the the Acrobat Pro XI serial number it will look for a previous qualifying version on your computer. If not found, you have the option to enter your previous version serial number so would enter your Acrobat Pro X serial number.
Hope this helps.