unreal crush all the times on my mac

Hi, the unreal engine works really suck in my mac. It will not able to resiponde even when I tried to create a new folder. Does anyone know the reason, and it asked me to download this plugin. I don’t sure if there is any relationship with the crush. And this is my mac information. Thank you guys!Screen Shot 2017-06-02 at 7.19.02 PM.png