The link you posted and the "Get Norton Security Online" link on that page work for me. Which link are you having trouble with, and what does "broken" mean exactly? Any error messages? What browser are you using? What OS? The more details you can provide, the better.
The page you are looking for may have been moved, updated or deleted.
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The link also works for me. Are you signed in at the time you're trying to access the page? Have you cleared your browser cache?
Scroll down to the bottom of this page and click on the link to Download Norton Security. Are you having the same problem accessing the page?
Which browser are you using?
What is your operating system?
Are you logged into your Primary Comcast Account?
Are you connected through your residential modem?
Have you gotten it sorted with the info provided by others?