I have tried to download your online Norton Virus Protection several times over the past several months from this page (https://internetsecurity.xfinity.com/products-and-services/norton-security-online/) and the link (https://idp.comcast.net/idp/startSSO.ping?PartnerSpId=www.symantec.com&TARGET=https%3A//cloudconnect...) does not work.
Any help would get great!
Perhaps the following info may assist you:
The links you proivded work for me - I am using the Chrome Browser on WIN 10. Perhaps you can try a different browser - I have had situations with Edge Browser lately.