I cannot download the Comcast/Xfinity Norton Internet Security for Mac. From the Constant Guard Internet Security by Xfinity page, clicking on "Get Norton Internet Security" or clicking on the Apple Mac icon takes me to "http://my.xfinity.com/errors/unauthorized/?lang=en&ui_style=light" webpage which says, in part, "Sorry, we couldn't find that page..."
I tried this on TWO separate Macs: One running High Sierra (which might not be supported yet, according to the System Requirements) AND one running El Capitan (which already has NIS for Mac installed).
When I contacted Comcast Chat Internet Support, rep gave me a number to call for their "Norton Specialists...who can help with settings and installation..." I will try this in a little while (they open at 9 AM EST) and report back.
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