AMSAT with help from its partner New England Sci-Tech prepares a bulletin of orbital elements during the first hour of the UTC day, and posts it to https://www.amsat.org/tle/daily-bulletin.txt as well as "bare" elements without the bulletin header and footer at https://www.amsat.org/tle/dailytle.txt .   Other files and URLs with "nasa" and  "ftp" in the URL are still maintained to support older software, but suggest organizations protocols that are no longer involved in TLE dissemination.  Use of older filenames and URLs is deprecated and AMSAT does not promise to maintain them in perpetuity.  

End users and software developers are encouraged to use the URLs above going forward.    The files are available via HTTPS (preferred) as well as unencrypted HTTP for legacy software.