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...that in the case of this type of the $15 Windows 8 Upgrade, you end up with a standard Windows 8 Pro DVD. The upgrade is verified during the download not during the install. As such, you can use this disk to perform a clean install of Windows 8. If you look back over the screen shots, nowhere does the installation procedure look to verify a previous installation of Windows 7 on the hard disk.

With this download, there is no need to reinstall Windows 7 just to install Windows 8.