The CC3 extension can't be installed, as the installer doesn't find CC2, while 2.3.2420 is installed in my C:\program files. That is on the main drive, and fully functional. Hum...
Thank you for your feedback.
CC3 Pipeline Extension is not used for upgrade CC2 to CC3, it is used to extent the functionality of CC3. So you need to install the CC3 free installer first, then install this paid CC3 Pipeline Extension.
Reallusion