You must run the bat file every time you add a morph package to the runtime.

As for the DAZ Install Manager, you need to configure the software so that it finds your Poser 11 Runtime folder.  Once properly configured, all your DAZ purchases, in ZIP format, will appear under the download tab.   Select the files associated with Poser, direct DIM to your Poser runtime folder pathway, and press the install button.  The software will install the files in their proper hierarchy order and folders where they belong.  

But, as I stated, you need to configure DIM first, otherwise, the files will be installed into a default DAZ Library folder.  The content can still be accessed if that Library is linked to Poser, but that wouldn't be practical, IMHO.