I usually link the old runtimes to the most current Poser library.  Just to verify, IIRC you need to run the .COMMAND file on a MAC to activate the morphs and all the necessary files should be in the same runtime as the morphs.  If you meet all the criteria I mentioned, it should work.  Otherwise, I'm at a loss.  I'm not familiar with MAC OS but the procedure outlined should be similar to a Windows PC.