This is a great question.
I normally update the 1st post of the thread and sometimes even attatch an updated info file in the thread. I wouldn't change the file names since they don't relflect what was seeded in the torrent. At least if you post the info in the thread and/or edit the first post somebody who is researching the show later can find it.
In fact, this just happened to me
http://www.thetradersden.org/forums/...ad.php?t=15058
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