DAZ3D V4/M4 morph installation is a unique situation and is not repeated with any other figures, either DAZ or not.  Barring file corruption, you shouldn't have any issues.  I am surprised that the DAZ Generation 4 figures are giving you so much trouble.  I have installed them and activated on a second computer without any issues.  It doesn't matter if you have them in a separate runtime or drive, the procedure remains the same.  The figures are installed into the runtime of your choice then install the morph package into the same runtime folder.  Activate the figure channels with the BAT file that is included with the installation.  My suggestion, if you have multiple morph files to install, i.e., Muscle, Creature, Elite, etc., load each package and activate separately so there is no confusion the channels.