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To activate Webroot using a product key, start by visiting www.webroot.com/safe. On the webpage, you'll find a field to enter your product key. Input the key and click "Next." Follow the on-screen prompts to either create a new Webroot account or log in to your existing one. Once logged in, download the Webroot installer and run it. During installation, you'll be asked to enter your product key again to confirm activation. Complete the setup process by following the remaining instructions. Your Webroot software should now be activated and ready to protect your device.