Trying to shoot tethered with NIKON D 7000 ON iMac and Macbook Pro, both with El Capitan. Worked fine previously as the normal form of shooting in my studio (pre El Capitan). It is unable to find camera but recognises it for upload of images.
Tethering Nikon and Leica cameras using Lightroom CC 2015 and Lightroom 6 (noticed on other Lightroom versions too) is not currently supported on El Capitan. Please refer Lightroom and El Capitan | Mac OS 10.11.