I suggest that you go to the webpage for HiveWire Big Dog and click on the readme file located at the Product Files on the right.  That should open an HTML page with the Vendor's install information as well as the list of where all the folders and files should go in DAZ Studio.  Ignore any information and reference pertaining to Poser, your primary concern is to install all your files correctly so that DAZ Studio will find them.  I am assuming that the two files available for download are specific to Poser and DS.  Read the Readme file several times so that you fully understand the Vendor setup.  Copy the Readme into an editable document and make notes, delete any Poser references, and highlight all important passages.  

Right now, you have spent half a month trying to install this content without progress.  We need to step back and start from the beginning again.