Hi all, I utilized the US$39.99 upgrade offer on Windows.com and used it on a system running Windows 7 Ultimate. This Windows 7 installation was is non-legit in the sense that it was activated by Daz Loader. Long story short: Yes. It works. You won't run into any trouble at all. I wrote an extensive post on upgrading. The entire process has been captured here: davejunia. com /2012/10/windows-8-pro-upgrade-experience/ My post count is too low to post a link: So, remove the spaces before and after com. Also, found out if you could do a clean install using the $39.99 upgrade on a system with no OS. I hope you find this useful.