Dropbox - LibreELEC.USB-SD.Creator.macOS.dmg - Simplify your life
^ I built this for testing the other week with changes to fix things that don't work. Catalina will whinge about the images not being signed by a trusted Apple developer (as I am not one) but once you allow the .dmg to open and the app to run (Control Panel > Security, etc.) it works. I need someone to fix the JSON parsing code (as I don't have the skills to fix that) and then I'll sign up with Apple to sign the binaries and solve all the security warnings.