Audio Research Ref. Cd 9 Mac Driver download

     Hello.  I'm am currently home auditioning an Audio Research Ref. Cd 9 which as a CD player is  working flawlessly and sounds amazing. The unit is 2nd hand and the previous owner no longer has or cannot seem to  find the CD with the drivers' on it for USB playback. I'm currently trying to test the DAC capabilities but have only been successful via toslink as the cd player/Dac is not all detectable in/via USB mode/connection.
      I'm using a macbook air for this setup ( El Capitan 10.11.6) . I have  searched the Audio Research website and found the owner's manual ( also missing ) which states that when using a Mac no special drivers are required but it's not working or discoverable at all. There is no current driver for Mac downloadable in their website as well. While searching some more I found that there was another user's manual( maybe depends on the year model, the one on audition is 2-3 yrs old ) which states there indeed is/was a Usb driver for mac contained in that CD. Can anybody help me out?.  Any leads would be appreciated. It's a wonderful CD player but of course, I would want to get the most out of it ( or at least the audition )   and yes I have emailed Audio Research and waiting on the their response as well.  Thank you.