Can't Manually Install iTunes in MoJave

I had to uninstall iTunes manually because NONE of my purchased or rented videos would play back properly. I would get green, glitchy screens during playback. After trying everything I could find, there were no solutions. So I manually uninstalled iTunes (which was an absolute pain). Now I'm seeing that I can't reinstall it without having to completely reinstall the OS? Is this true? This must be some kind of joke!

Does anyone have a work-around for this? Your help would be greatly appreciated!

Cheers,