Once you’ve upgraded to Windows 10 using the free upgrade offer
or Media Creation Tool
on an activated Windows 7 or 8.1 PC, you will be able to reinstall, including a clean install
, on the same device. You won’t need a product key for re-activations on the same hardware. If you make a meaningful change to your hardware, you may need to contact customer support to help with activation. You’ll also be able to create your own installation media like a USB drive
or DVD, and use that to upgrade your device or reinstall after you’ve upgraded.
You do not get a product key with the free upgrade of Windows 10.
The activation for the free offer of Windows 10 is registered on the Microsoft activation servers, and is referenced by the hardware (motherboard/CPU/graphics card) of the PC it was upgraded on.