You guys are my last hope. I've been looking for an answer to this for days and I can't believe I can't find it. Right now: I have Parallels Desktop 8 installed on my MBA, and I have Windows 8 Release Preview installed on it. This Release Preview will expire next week. What I want: To buy and install a full version of Windows 8 RTM as a replacement. I've read that it is not possible to upgrade from Windows 8 Release Preview to Windows 8 RTM. My only option is to use this System Builder disc. So if this is true, how can I do this without a SuperDrive? Can i create an ISO of the System Builder disc using my Windows 7 laptop and then use that ISO with Parallels on my MacBook Air? Is there anything else I can do? Any help is immensely appreciated!