To get started with downloading and installing Xfinity Norton, visit the xfinity.com/authorize website and navigate to the "Security" section. Choose Xfinity Norton and select your preferred plan. Download the software and run the setup file. Follow the on-screen instructions to complete the installation process. Once installed, launch Xfinity Norton and activate it using your Norton account details. Ensure to regularly update the software to stay protected against emerging threats. With Xfinity Norton installed, your devices will benefit from comprehensive security features, safeguarding your digital presence effectively.