The Windows 10 product key is normally found outside the package, on the Certificate of Authenticity. If you purchased your PC from a white box vendor, the sticker might be attached to the machine’s chassis; so, look at the top or side to find it. Again, snap a photo of the key for safekeeping.What is the activation product key for Windows 10?
To activate Windows 10 by entering your Windows 7, 8 or 8.1 product key: Step 1: Open Settings app. Step 2: Click Update and security. Step 3: Click Activation. Step 4: Enter your Windows 7, 8 or 8.1 product key and then click Next button to activate your Windows 10.