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#20
I used a Retail Upgrade DVD with the the Digital River and MS key without a problem. As a mater of fact I have thrown out the downloaded DVD's as I can just use the retail upgrade disks now that I got them in the mail. The hole Digital Rivers thing was a disaster because if you were running a 32bit OS and bout the x64 upgrade it wouldn't load. They should have made this info clearer before purchasing. Basically you need to have the same version bit installed in order to us the upgrade, or be smart enough to work around it. Also I wish I would have seen the fine print about the PRO version. Oh well.