New
#11
Rocket Racoon: "But what if I want it more than the person who has it?"
Rhomann Dey: "Still illegal."
Rocket Raccoon: "That doesn't follow. No, I want it more, sir."
Having a need does not change the legality of it. This is nothing new, and this is how upgrades to Windows have always worked.
If you want to run two instances, for whatever reason, you will need two licenses.
The Product Key you recovered is not a valid key for installation. It's a generic key used for all upgraded copies of Windows 10. So even recovering this key will not allow you to re-install clean.
You *MUST* perform an upgrade from Windows 7/8.x on new hardware at least once before it will activate.