The download of installers don't have anything to do with the download of the live updates that happens IN the installer, they are on entirely separate servers and are totally unrelated.
There's a specific problem with a single server on Mediafire, which is affecting only the JFK 2 installer, because Mediafire keep each download on a separate server, and that particular server is probably down so, we are uploading it again, hopefully it should go to a server that works.