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)
   MinClient=8400.0
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.

Disclaimer

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.