The folder is located in your C drive and has the name $Windows.~BT.
The folder is located in your C drive and has the name $Windows.~BT.
The device creates a unique hardware identifier that the system checks to confirm your Windows 10 activation. During a clean installation, it restarts the base using that identifier. After free upgrades finish, you may need to purchase a Windows 10 license again, unless your license is available as retail rather than OEM.