I can understand why you're getting frustrated! But stay calm and persevere - I'm sure that you'll get there.  :)

I've just rechecked the default installation locations for the M4 Morphs++ package:  All the files it adds are under either /Runtime/Libraries/!DAZ/ or /Runtime/Libraries/Pose/ . That reminded me of a couple of mistakes I made ages ago (and there's a very slight chance you might have done the same) -

1 - you shouldn't move any of the files that are under /Runtime/Libraries/!DAZ/ . You don't access these PZ2 files directly - the pose files under  /Runtime/Libraries/Pose/ call them. If you move them those pose files can't find them.

2 - you can modify the subfolder structure under /Runtime/Libraries/Pose/ to your hearts content - but the PZ2 files must remain somewhere under /Runtime/Libraries/Pose/ - if you put them under /Runtime/Libraries/Character/ for example, then they won't show up at all in the library pane.

P.S. Re your latest comments. The shrugging man is to be expected if you only copied the PZ2 file (and not the associated PNG). The broken image icons indicate that the PNGs are indeed corrupt. And a corrupt/bad Poser file will sometimes give you that "not a valid Poser file" message (but not always!). (I deliberately corrupted some copies of my files and got exactly what you described.

Corrupt files are going to make it even more 'fun' to get to the bottom of this!  ...

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).