OK here it is. You don't need I just got done installing everything on my 27 in IMac El Capitan. and my PC and my x-t1 tethers correctly on both. I used This Adobe Extension Manager | Download Adobe Extension Manager CC Adobe Add-ons For Mac Adobe Add-ons For Windows Download and install extension manager cc first, you do not need HS-V5 Not sure I explained it good enough, but Fujifilm X-T1 tutorial: how to shoot tethered to Lightroom for Mac • owen billcliffe photography Good Luck