Thank you. It turned out that I had the demo app on MacOS for a long time, and I was launching it, but not the new full version. And the new full version started to open after "chmod +x" as described on the support page.
My IterLinkDX USB controller, which works fine with the FPVFreerider on Windows 10, does not work on MacOS for some reason. When I click on the "Start Race", there is the sound which announce the race, but then nothing happens.
I calibrated it couple of times, restarted the MacOS, it does not help. Do you know what else I can try to do to make the USB controller work?