Hm. I have my M4 in an external Runtime (called M4Runtime) and he works beautifully. It's placed somewhere under my Poser 7 installation (since I made it while using Poser 7) Still works like a charm in Poser 8.

Did you run the .bat file that comes with him? He needs to be initialised to work.

If that's not enough, You can try tricking it by making a blank txt file and renaming it to Poser.exe, then placing it where you want to install Mike. That usually works with the Daz installers.

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.