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The Muscle Morphs appear as a separate group, under the other morph groups for Victoria 4.1 (not Victoria 4 plain). If they aren't appearing make sure that you aren't using the Rem poses, that you installed to the same folder as for the base figure (and Morphs++ if you have it) and that you ran the updater utility (or for Windows allowed the installer to run it),

 

Hmmm... I'm not sure I understand.  Other morph gourps?  Other than what?  And Rem poses...? I have some "muscle" poses that came with it, but they are just poses.  They don't change the musculature ofthe figure.  In the INJectors folder, there is a "+" injectors and a "-" injectors icon that apparently adds or removes the injectors from the figure, but again, selecting either of these has no effect that I can find.