I renewed my interest in using Zerynth as I noticed that the Sony CXD5602 is supported now. I installed the latest version on my MacBook (Mojave) and tried to get it running.
Installing Zerynth was not enough. The missing piece is the Syllabs driver for the USB connection.
After installing that missing piece the Sony SPresense became visible and programming the boot loader and virtualising it worked.
Now I tried to upload the gnss example and the three leds blinking, but every time it could not download it. It seems like some timing issue.
After tying a few times I took the step to fire up my Windows PC and do the installation all over again and it worked without a hitch.
Would you please check out the issue with OSX?