Thank you for the test version of ksatrs. Unfortunately, the update did not solve the problem for me.

I ran into a problem running the python setup: it verified that home-brew was installed and attempted to instal python. After a short time, it put up a dialog saying: “Python installation failure”.

I opened a terminal window and attempted the installation per your instructions elsewhere in this thread. Home-brew claimed python was installed and up to date. I checked:

Robert-Lucass-Mac-Mini:~ rnlucas$ which python
Robert-Lucass-Mac-Mini:~ rnlucas$ which python3
Robert-Lucass-Mac-Mini:~ rnlucas$ python3 -V
Python 3.7.3

After this, I retried the setup, and this time it appeared to complete normally.

Robert-Lucass-Mac-Mini:~ rnlucas$ pip install astropy
Requirement already satisfied: astropy in /usr/local/lib/python3.7/site-packages (3.2.1)
Requirement already satisfied: numpy>=1.13 in /usr/local/lib/python3.7/site-packages (from astropy) (1.16.4)

However, it still seems to fail in the same way (from Ekos):

2019-06-15T19:10:09 Solver failed. Try again.
2019-06-15T19:10:09 Error starting solver: Process crashed
2019-06-15T19:10:09 Reading input file 1 of 1: "/Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits"...
2019-06-15T19:10:09 /Applications/ -O --no-plots --no-verify --resort --downsample 2 -3 302.861 -4 35.8077 -5 15 --config /Applications/ -W /private/var/folders/k7/18sgd_pd0fd_khn8l64crc0r0000gn/T/solution.wcs /Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits
2019-06-15T19:10:09 Starting solver...
2019-06-15T19:10:09 export PYTHONPATH=/Applications/
2019-06-15T19:10:09 export PATH=/Applications/
2019-06-15T19:10:09 Solver iteration #1
2019-06-15T19:10:09 Using solver options: -O --no-plots --no-verify --resort --downsample 2 -3 302.861 -4 35.8077 -5 15
2019-06-15T19:10:01 Capture aborted.
2019-06-15T19:09:56 Capturing image...
2019-06-15T19:09:48 Detected version 0.76

From the command line:

Robert-Lucass-Mac-Mini:~ rnlucas$ /Applications/ -O --no-plots --no-verify --resort --downsample 2 -3 302.861 -4 35.8077 -5 15 --config /Applications/ -W /private/var/folders/k7/18sgd_pd0fd_khn8l64crc0r0000gn/T/solution.wcs /Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits
Reading input file 1 of 1: "/Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits"...
Illegal instruction: 4

I'm on macOS Mojave 10.14.5.