AJR said:
Previous experience has resulted in a message that, booting with the
upgrade version, resulted in a message that setup requires Windows.
No, that's not correct. If you use an Upgrade version, you need to own a
previous qualifying version. If you're doing an upgrade with that Upgrade
version, the previous version will be found on your drive.
If you're doing a clean installation and the previous version is not on the
drive, then you will by prompted to insert its CD as proof of ownership.
Only in that second scenario do you get such a message.