Thank you for the information, it's interesting that you got it working with an older version. Do you have any idea how old it may be - for example, does it have the round "Racetrack Generator" icon on the main menu?
In the recent releases the zip file is named with the build date in the filename (for example "FPVFreerider_MacOS_2019-11-23.zip" for the latest release). So if you still have the zip file for the working version you might find the date there (unless it's a really old version where the date is not in the filename). Also, sometimes it seems to work if you unzip the zip file on a Windows computer and transfer it to your Mac via a USB drive for example, but perhaps you have already tried that.