Ok, so I bought the Poser 8 Upgrade version using my Poser Pro serial number at CP and downloaded and installed it. Guess what? Even though there's a place for putting my Poser Pro Serial number in, since it's an upgrade version, that box is greyed out and it only lets me put in my new Poser 8 Serial number.  Not that I mind only having to input the one serial number when installing it, but doesn't that defeat the purpose of requiring a second serial number for the upgrade version?!?