I can't comment about the extension. I'm not familiar with that at all. However, the camera requires Lightroom 6 or Lightroom CC or the latest DNG converter (free option) to create DNG copies that you can use in older versions of Lightroom.
DO YOU HAVE A SOLUTION AS THIS PROCESS IS TIME CONSUMING AND UNACCEPTABLE?
You haven't told us which version of Lr you're using (which kinda matters), but as Jim points out, the likelihood is that you're using an obsolete version.
Thank you for the reply. I believe that I do have the latest version of lightroom I belong to Creative Cloud and have the latest of photoshop, lightroom, illustrator as I always have access to upload upgrades ….I will double check when at studio computer to make sure latest version is installed…joan
NO I AM SURE LATEST BUT WILL DOUBLE CHECK I BELONG TO CREATIVE CLOUD AND THEY ALWAYS SEND LATEST UPGRADES…