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Upgrade Windows 7 RC to RTM

Although Microsoft says it is not possible to upgrade Windows 7 RC (or beta) to Windows 7 RTM it is possible with a little tweak to an installation file.

This is how it’s done:

1. Copy the contents of the ISO or DVD to a separate storage location (such as a bootable USB storage device, a separate partition or whatever)
2. Open the file \sources\cversion.ini in a text editor and modify the MinClient number to a number lower than the version Windows 7 that you want to upgrade from – so for the beta you would set this to something like 6900.
3. Save the file and then run the install routine from the location with the modified file

Source: http://blogs.msdn.com/e7/archive/2009/04/07/delivering-a-quality-upgrade-experience.aspx

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Categories: Windows 7 Tags: , , ,
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