Quote - I guess there is no clear, for dummies explanation.

You have to install the DSON and the starter files.  Then you have to install all the stuff you want to play with and the poser companion file. If there is no PC file it won't work in Poser.  The genesis classic they gave us the first year has no poser companion file so it doesn't work.  For me I got their install manager and did an install to a new runtime folder and just let the installer do all the heavy lifting.