The packaged app is going to crash on the Macbook Pro mid-2011 because it is running HD Graphics 3000 with open GL 3.3, which is not compatible with UE4. Please send the crash log from the Macbook Air which is running HD Graphics 4000 with Open GL 4.1, which is compatible. Also, does the packaged app run on the Pro Retina 15 inch that it was developed on?