Very simply, I can’t open the Epic Games Launcher to install any Unreal products. Apple throws the error message:
The application "Epic Games Launcher.app" can't be opened.
There are no logs produced or other error information displayed. The only workaround I can determine is to open the package’s contents run MacOS/EpicGamesLauncher-Mac-Shipping manually from terminal.
Even though this workaround exists, it’s not documented anywhere. I submit this as a bug report so that you can identify the issue, as well as help any wandering Googlers get things going.