
You can check your e-mail ID which you used to register on Microsoft website to find the product key. If you have downloaded Windows 10 from Microsoft’s website then you will find the product key in the confirmation mail.

In case, if you have not upgraded to Windows 10 (performed Windows 10 clean install and forgot the Windows 10 license key) and are wondering how to view your product key in Windows 10 which is installed on your system then you can follow these methods to find your Windows 10 product key:

How to Deactivate Windows Product Key and Use on Another Computer.

How to Install Windows 8 or Windows 10 without Product Key.
