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To download and install Xfinity Norton, start by logging into your Xfinity account. Navigate to the Security tab and select Norton Security Online. Click "Get Norton Security Online" and follow the prompts to download the installer. Once downloaded, run the installer file and follow the on-screen instructions to complete the installation process. During installation, you may need to enter your xfinity.com/authorize account credentials. Once installed, Norton will automatically start protecting your device from online threats, viruses, and malware. Ensure your device stays connected to the internet throughout the process for updates and activation.