accidentally deleted the iTunes file

Hi I accidentally deleted the iTunes file from the 'system information' --> storage managing window so...

HOW I CAN GET IT BACK ????

Because all the apps that are related to iTunes won't work with me the only thing that would open is the window for iTunes-apple music and apple tv+ but they won't work and it says " THIS CONTENT NO LONGER AVAILABLE. " BTW the app icons are still showing but they won't work  

So please if anyone knows anything i can try to get the apps working again