I can't even get to that point, where it asks where I want to install the files.  The DAZ screen opens, it starts searching for installed components, and then I get the error.

I wonder...
After installing M3, I moved the folders that go in the Poses Library.  Maybe that's what's causing it.  I'm going to try installing him again and leave everything as is, then try installing the morph packs before moving anything.

"You don't know what we can see
Why don't you tell your dreams to me
Fantasy will set you free." - Steppenwolf