i use abc.. kinda like it and it works so...
if the error is like the last one then i guess the torrent is no good then. has happened to me a few times.. try downloading a new file, preferably with lots of seeds/dls and try again.. if that works then the torrent you are trying to get corrupt in some way.. and then you either have to wait for suprnova to release it again or wait/hope it appears on some other filesharingsystem..