Just tried to upgrade Windows 7 Professional to Windows 7 Enterprise.
Booted from the DVD to upgrade and the installation program told me to run the upgrade from within the existing OS.
Ran the Enterprise upgrade from within Windows 7 Professional and “no go” the installation program told me that to upgrade from one version of Windows 7 to another I had to go to Windows Anytime.
I suspect that I have been caught out by Microsoft's licensing policy the Windows 7 DVD apparently comes with every version of Windows 7 but only the licence key for the version you have purchased. To upgrade you buy a new licence key from Microsoft via Windows Anytime.
I am running evaluation version so do not have licence keys.
Just found some possible workarounds, changing a setting in the .ISO image, it’s getting late so will continue this at a later date. Check the links below as a starter.
Further Information:
Guide To Upgrade Windows 7 RC Ultimate to Windows 7 RTM Enterprise
How to Upgrade Windows 7 RC Ultimate to RTM Enterprise
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