Launcher crash on MacBook Pro

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!

[link text][1]

92353-螢幕快照+2016-05-28+下午3.19.29.png

After update my mac to 10.10.5, I can run Epic Games Launcher now.

but it crashed after login.

oh~ I have two Epic Games Launcher instance runing.
I close one of them and now it works.