On https://www.mtishows.com/marketplace/resource/pre-performance/rehearscor...
the system resources tab indicates: Apple: Compatible with iPhone, iPad, and iPod Touches. Please note, if your device is running below iOS 11, you will not be able to run this software.

When I try to download the MTI RehearScore app, I am informed that it requires iOS 17.5 or later. My iPhone SE (1st generation) was updated to iOS 15.4.8 in March 2025, and can not be updated to a later major version of iOS.