It's not published (yet), but my downloadspeed was so slow I just tried some urls from other Mint downloadsites. This one worked (my speed went up from 5K to 300K): http://os-iso.de/linux-mint-30-kde-p-202.html
I echo to request for more torrent seeders.
One hint: as I downloaded parts using http, I copied the partial downloads to the torrent directory.
KTorrent: If you select Data Integrity Check on KTorrent it verifies your download and starts seeding the part you had downloaded thus far.
utorrent: On utorrent you delete the torrent and restart one in the same datadirectory. utorrent starts by checking the parts and discovers also the already downloaded parts and starts seeding them.
Other torrent clients should work likewise.
For environmental reasons I will shut down my computer shortly, but will start seeding tomorrow morning again.