Install Win8 RTM on top of RC (upgrade from release candidate)

Today I wanted to upgrade my RC (release candidate) of Windows 8 to RTM. This is "unallowed" by the installer and the installation exits. To be able to install on top of a RC you need to do the following:

  1. Download the Windows 8 RTM ISO file
  2. Unpack the ISO file to a folder on your computer
  3. Open the file ..\Win8-unpacked\sources\cversion.ini
  4. Edit the MinClient value to represent your build (you can get the build with winver.exe)
  5. Save the file
  6. Suspend bitlocker protection before running the upgrade (using Control Panel)
  7. Start the  ..\Win8-unpacked\setup.exe and choose upgrade
Happy upgrading to RTM.

Do this "unallowed" upgrade on your own risk. Microsoft have prevented this for a reason but some of us geeks what to do magic stuff and test things that are unallowed.

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