Click the 'Continue' button if it appears. Scroll down and click 'Install' to continue. Go to the website and click the 'Security' link in the top right corner of the page. How do I get free antivirus through Comcast? Sign in with the Comcast user name and password. To install Norton Security Online on a different computer, log in to that computer and then download Norton. How do I download Norton for Comcast?įollow these instructions to download and install the latest version of Norton Security Online on the computer. Read and accept the Norton license agreement and privacy notice. Tap after the completion of download and install.