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In the Norton Security Online box, click Download Now.
If prompted, sign in with your Comcast user name and password.
Your PIN should be displayed at the bottom of the "Welcome to Norton Security Online" screen.
@Ap311985 wrote: need now please Norton 13 charter pin code.
Comcast no longer provides AV software. See https://www.xfinity.com/support/articles/norton-security-online-sunset. They claim that their xFi Advanced Security takes its place, but that's a gross exaggeration.