What you need assuming you're windows based :
(1) quickpar2
http://www.quickpar.org.uk/Download.htm download and install
(2) A binary newsreader : I have been using newsbin pro I stll prefer version 4 over 5 though.
(3) use newsreader to connect to news server : in my instance it's news.blueyonder.co.uk
(4) subscribe to some news groups eg alt.binaries.movies.divx and say download a file (all tar files and especially par files for that single post)
(5) Once downloads are complete goto the download directory double click on a par file and verify that you have all the files u need and that they are not corrupt.... if the post is corrupt repair
(6) extract file with winrar and enjoy