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Make sure you’re up to date on any Windows Updates.
- Click Update & Security and go to Activation (see the picture below).
- Find the ‘Change product key’ and click it. A window requiring you to enter your product key will appear.
- Enter your product key that you received with your order, click Next, the upgrade will start, and you’ll soon get a message that Windows has been upgraded.
(middle icon in the left bottom corner).