To download a GPS log file using EOS Utility, use Map Utility 1.8.0 or later for EOS 6D Mark II, use Map Utility 1.7.2 or later for EOS 5D Mark IV, use Map Utility 1.7.0 or later for EOS-1D X Mark II, use Map Utility 1.5.3 or later for EOS 7D Mark II, and use Map Utility 1.5.2 or later for EOS 6D. I also have High Sierra (10.13.1) and am running EOS Utility 3 (3.7.0) with a 5D IV (firmware 1.0.4..