[Jeff Producer]

Yeah – I got a Win 7 machine and had to re-install all software – upgraded my purchased DVD Architect 4.5 to 5.0 (no problem) than ran into the same problem that you did trying to upgrade 5.0 to 5.2 (I have Vegas 8.0 which upgraded to 8.0c and then 8.1 – no problem)
I guess Sony Creative considers the 4.5>5.0 ‘upgrade’ not to be ‘official’ enough (meaning purchased) for upgrade to 5.2 – generally speaking – their upgrade instructions aren’t very helpful that way (meaning the don’t tell you what prior versions can upgrade)- just trial and error.
Maybe wait until 6.0 comes out then just buy an upgrade…if you need it