Cosmic King:
easy,go to delta torrents anime and search urusei yatsura,of course u need bit torrent or bitcomet,i dont hav those programs as my cousin downloads the episodes 4 me (only some,he is kinda grumpy sometimes)
Forgotten_Lum:
you can now download every episode at http://www.mininova.org/search/?search=urusei+yatsura using a bittorrent of coarse