If you are currently downloading any of our old torrents (pre-Getter episode 21), you may want to erase the torrent and re-download it. Nyaatorrents took down their trackers with the recent legal scares but they have replaced them with other trackers. These old torrents should work, but you will have to update the tracker.
(Tracker now used: udp://tracker.openbittorrent.com:80/announce)
If you are having any problems, you still have the direct download option as well.