Follow Up and Summary - Programming FPGA Boards from a Mac
Thanks to those who responded to my request for methods for programming FPGA boards on a Mac.
Since then I have found a mechanism that is working very well. It is called Open OCD (search the web). This is an open source solution that we have tested on a number of Digilent boards (Nexys4, Basys3, Arty).
It works for both a Mac as well as Linux (useful since we could never get Adept 2 installed in a way to work on Ubuntu 16.04).
I have created a web page that describes how to use it at: https://github.com/byu-cpe/BYU-Computing-Tutorials/wiki/Program-7-Series-FPGA-from-a-Mac-or-Linux-Without-Xilinx
Feedback appreciated.