Is there any way I could download a iphone app to my mac book pro?
I think this has been answered before in this thread.

The general reason is that the code is compiled for an ARM CPU (iPhone, Samsung, Pixel, etc).  Your MacBook has an Intel CPU and the code instructions are different.  As a developer, there is a simulator in Xcode to develop a mobile application with, but the simulator is not really for use to obtain an application from the App store and run it.