received my two boxes of Windows 7 Professional Upgrade on Thursday October 22, 2009 as Amazon promised they would.
My first install would be on my MacBook Pro. I first tried upgrading from Win7RC 64-but to Win7 64-bit Uon my Macbook Pro in Bootcamp. It would not work for me, as I kept getting an error stating it “could not create the installation folder”. I had an additional 27GB in the partition, so this could not be due to a space issue. I even tried another Win7 Upgrade disk in case there was an error on the DVD. Same result.
So I went into OSX (Snow Leopard) and used the Bootcamp Utility to delete the Windows partition and re-create a new one and go through the clean install process. I was not sure I could use the upgrade DVD on a clean install, but went for it anyway.
I used the “Custom Option” process and formatted the partition and installed. After most of the install process, a couple of reboots, I finally got to the “Type your Windows product key” screen and it kept telling me the product key was invalid. I tried it a dozen times, even changing a B to an 8 to see if that was the issue. No luck.
Had to call Microsoft. First Rep could not give me a case# so I had to call back and get another Rep. who validated that my Key is good, gave me a case number and transfered me to an install technician in India with a strong accent. Could barely understand her. Gave her my case number and we went through the same thing as the first rep (what is the case number for if not to tell the technician what the issue is and what has been done by the first rep?). She activated the key on her end(?), told me to delete the key and move on with the installation without adding a key. The install process continued & completed. Inserted my OSX Snow Leopard CD and installed Bootcamp Drivers. Rebooted, activated and all is well.
So in my case, you could install an upgrade version of Windows 7 on a clean partition without installing Vista first.