Note that each edition of Windows uses its own unique product key. For example, if you have a license for the Windows 11/10 ...

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

If these methods do not work for you, you can also use some free Software Key Finders to recover and save, not just Windows, but even Office, Software, Games serials and license keys. This post ...