I’ve built a electron app with ‘electron packager’ from OS X El Capitan, but “myApp.app” no run in Os X Mountain Lion, help me please !
Since you haven’t provided the exact error message, I’m going to assume this is Gatekeeper related. Try a right-click on your app and select “Open”, then confirm.
As a long-term solution, you should sign your application. electron-osx-sign seems to be the way to go.
If all fails, you can disable Gatekeeper, but that’s usually not recommended.