I was used to be able to download Free Norton. Now I just got a new laptop without security software. I logged onto my comcast acct and click Download Norton Security ... It redirected me to https://webdl.symantec.com/ , then I click "Start Download", Save and got this text file Norton_Download_Manager_exe_LNG=ENG&latest=false&inject=false
The following link is for the Knowledge Base article that covers the initial installation of the free Comcast Norton Securtiy Suite. I verified the link for the download within that article is in fact working.
Please let us know if you continue to have problems with the installation.