1.download install EpicGamesLauncher-2.11.9-2970807.dmg from unreal site.
2.double click EpicGamesLauncher-2.11.9-2970807.dmg
3.drag Epic Games Launcher.app icon to Applications
4.run Epic Games Launcher.
5.Epic Games Launcher start download.
6.Epic Games Launcher finish download.
7.run Epic Games Launcher and it crash.
I install old version 4.9 before, but this time 4.11 failed.
thanks for your help!