

But Microsoft hasn’t been handing out Windows 10 product keys to upgraders. In this case, the product key would always serve to activate Windows. If you buy a new copy of Windows 10–for example, to install it on a PC you’re building yourself–you’ll also have a product key. Even modern Windows 8 and 8.1 PCs–and new PCs that come with Windows 10– have a Windows product key embedded in their UEFI firmware. The free Windows 10 license works very differently from previous Windows licensing systems.

RELATED: How Does Windows Activation Work? Why You Can’t Just Use a Simple Product Key Microsoft’s documentation now explains exactly how this works. You’ll be able to tell Windows that you “changed hardware on this device recently” and select your PC from a list of devices associated with your Microsoft account. Click that option and sign in with the Microsoft account you associated your license with. Head to Settings > Update & Security > Activation and you’ll see a “Troubleshoot” option if activation failed.
