how do you install TCS3 Upgrade? From DVD or thru a build as an Enterprise Deployment?
However, if Acrobat X Pro or older is installed the setup (or msi) cannot install Acrobat X Pro.
Please deinstall older Acrobat at first.
It was downloaded from the Adobe site. We found it took an uninstall of TCS3, Registry cleaning and fixing, and reinstall of the whole package for Acrobat X Pro to install properly.