Does this error help?
Code
pabreu@Paulos-iMac:~/Downloads/LibreELEC USB-SD Creator.app/Contents/MacOS $ sudo ./LibreELEC\ USB-SD\ Creator
Password:
2020-08-16 10:22:12.052 LibreELEC USB-SD Creator[63762:3818003] The application with bundle ID com.apple.ScriptEditor.id.LibreELEC is running setugid(), which is not allowed. Exiting.
This is in the Terminal. I cd to LibreELEC USB-SD http://Creator.app/Contents/MacOS and try to run it from there.
So perhaps setguid has been disable even for root in macos?