He is confronted with a system security feature that requires all applications to be signed (and preferably distributed only through the Apple app store). You can go to the tab "Settings"> "Security and privacy"> "General" and select "Anywhere" from "Allow application downloads". You can temporarily change this when you start Android Studio for the first time, and then change it. You can also right-click the Android Studio icon and select "Open" in the menu; he will give you another warning with the option to continue running it.