The simplest solution would be simply to offer a .torrent &/or magnet link as an alternative download on the main download pages (and archives), and add the http url as a web seed to start things going. That would definitely ease the congestion on your server, at least from the torrent-savvy.
Maybe then you could offer a direct link to start the respective torrent from the alert popup. How this would integrate with the linux installer, I am not sure yet, but it would work for Windows/OSX.
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