Lightroom 6.1.1 is the minimum version required to use raw files from Sony A7R II (ILCE-7RM2) camera.
You can upgrade your Lightroom version to Lightroom 6 or Lightroom CC for the files to be recognized.
You can also download DNG converter to convert the files into DNG, prior using it in Lightroom.
Hope this helps.
It did help, thank you.