The product key is stored in the Windows 10 Registry File, so it’s possible to find the code there if you know the right key. To do so: Type regedit into the Windows 10 desktop search ...

If you upgraded from a previous version of Windows to Windows 10 for free, you should see a digital license rather than a ...

3. Now you'll need to enter a code. Type or copy in this (it's case sensitive) and press Enter: If you bought your PC or copy of Windows 10 in a store, you'll find your product key on the packaging.