Guess you have download Camera Raw Plugin installer :
Please refer below links :
Lightroom 6 .6 is not affected by the camera raw plug-in. That technology is built into the camera raw program. Unless you are using Photoshop CC 2015, or the latest version of Photoshop Elements, the camera raw plug-in is not something you can use. If you have installed Lightroom 6 .6, and your camera is on the list of supported cameras, that is all you should need. Do you use Photoshop CC 2015?
When you have Photoshop or Photoshop Elements installed then the installer will automatically put the plug-in where it is supposed to be. But if you don't have a program that supports camera raw then there is no point in installing it.
Thanks, Jim, that is the answer. Thank you for your help. Richard