I recently got back into Poser, Lost my MAT Pose edit file and am in dire NEED or a replacement so I may start to make new V4+ characters again.Does anyone know where I can download a new version of MPE? or does anyone have a copy they are willing to share? I am willing to design an entire character for anyone who helps me out.

I found it just by searching the Internet Wayback machine.

There are many archives of it - here's one at random

http://web.archive.org/web/20090210103533/http://koti.mbnet.fi/~ilaripih/MPEHome

You can hunt through the listing yourself if you want to find the very latest one that is there.

Those from the last year seem to be HTML pages saying "Not found". But when I went back to 2009 I found that one. Download seems to work.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

Just curious : Why would you want to make Mat Pose files?
Have you seen this?
http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2882166

poser comes with mz5 files now.  you add mat file to library as mt5, which is uncompressed mz5.