"Will the mdd plugin work in Pro2010?"

That I don't know. You'll have to find out at the VueScript page.

http://www.vuescripts.com/_A/index.php?id=1,0,0,1,0,0

"Also, does the autorig in Messiah work on V4?"

Well, you simply bring in any mesh, and V4 is no different. Tashar is reporting no problems getting V4 mesh into Messiah and rigging using AutoRig. I have not tried it myself.

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