I just got a new MBP (Yea, me) and am trying to install Parallels 4.0 on it. I upgraded from 3.0 -> 4.0 on my old MBP without incident, but using the same keys (and same user and org IIRC), I get the following message: The specified key cannot be used to activate the product. Please provide your key for the previous version of the product. The key is usually printed on the CD sleeve or sent to you by e-mail. Note that the language versions of both the upgrade and the previous version keys should be the same. I am using the same dmg (ParallelsDesktop-parallels-en_US-4.0.3810.351321.dmg) that I used on my other machine just last month, and am getting the keys from PDFs I have archived. Clearly I am missing something obvious. Any tips for someone that should know better?