I have just bought a mac book pro for tethering but I am unable to use this function with Lightroom 5 operating sys is El Capitan. If anyone has a solution or work around it will be much appreciated.
If you have a Nikon Camera Lightroom 5 will not be able to tether on El Capitan.
So you need to upgrade to Lightroom 6,Lightroom CC 2015.
That's right: you cannot tether a Nikon with LR 5.x under El Capitan. Either purchase or rent LR 6.4/CC 2015.4 or find a different tethering program. DigicamControl is free and probably supports your camera. Have it place the files in a LR-watched folder.