New
#70
When you clean install 10565 + on a clean system and activate it with a 7 key it is not stored. If you look with ShowKeyPlus you have the generic key and Windows is activated through digital entitlement. If you enter a Windows 10 key this key is stored.
If the free upgrade ends next year (my crystal ball says it will not) it could accept the key and just not activate when you connect to internet (or activate using an existing digital entitlement if your system was already activated of course).