If you are using a Nikon on Leica than there will NEVER be a fix for tethering using any version of Lightroom prior to Lightroom 6. You only option is to upgrade to Lightroom 6 or use a standalone tether product.
LR 5 was last updated end of 2014.
LR 6 was first released beginning of 2015.
Apple broke Nikon tethering with the release of El Capitan in mid-2015 by removing a deprecated capability in the OS Nikon was using.
Nikon programmed around the OS change 4th-quarter 2015.
Adobe added Nikon's new programming to LR first quarter 2016.
LR 6 and LR CC 2015 were the current version series of LR at the point Adobe added the new Nikon programming so you need LR 6 or LR CC 2015 for tethering Nikon to work.
Hi I have both light room 5 and 6. I cant get either to work. I tried re installing LR6 but have lost my hard copy from and serial.
What can I do?