Thank you for this idea for which I was long looking for!

However after having understood your solution I think this can be accomplished a lot simpler:
In regedit simply export...

Just for your information: Clean Install Windows 10 Directly without having to Upgrade First - Windows 10 Forums states in Step 2 & 3, that you need to use "...the same type (32-bit or 64-bit),...

Thank you for this quick answer!

The solution with the genuineticket.xml sounds pretty interesting. If I understand it correct, it will save me:
- installing Win10 and revert to previous Win7, as the activation is done by one...

If I revert to the previous Win version before the 30 day trial period of Win 10 is over: Will I be able to install Win10 any time after 29 of July 2016?

Reason: I started the upgrade, but some...