No. The upgrade is actually the full version of the program. It's called an "upgrade" because owners of earlier versions have historically been given a deep discount on the next version.

You will however need your Poser 6 serial number to qualify you for the upgrade price.  And when you download the SR updates for Poser 7 you will have to enter the Poser 7 serial number.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi