hum, sorry, but CompuForums.org gave you false informations on the process...
for all upgrades, from a unlicensed or not, you simply have to upload the new files to your location and activate the upgrade process... the script is able to detect what version you are using, and how to handle the process by itself...
visit
http://vbulletin.com for support on upgrades... here is a forum for support on modifications and hacks...