I don't think there is any difference between the Poser legacy version and LaFemme PRO.  I do believe that the PRO version was released before she was bundled into Poser but I could be wrong.  Although I don't own this package, the included Readme documentation does not address any morph problems nor any further requirements needed for this particular morph to work.  I would suggest screencap the before and after images and contacting the vendors.  You may be the only one reporting a problem but I think it is worth notifying the creators of this content of a potential bug.