Windows 10 made it a lot easier to re-activate Windows 10, thanks to the ability to link your Windows 10 licenses to your Microsoft account. How to activate Windows 10 with a digital license If you don't have a product key, you can also go from the Activation page directly to the Windows Store to buy a product key. You might do this if you're switching editions of Windows 10. You can follow these steps to activate a Windows 10 license even if you already have one active on your system.
(Note: you'll need to be online to activate.) Image Credit: TechRadar (Image credit: TechRadar)
