With the release of iTunes 12.7, Apple removed the ability to install apps on a connected iOS device by removing the App Store from iTunes.
I tried installing an older version of iTunes which still has the App Store, iTunes 12.6.3. However, when trying to log in, I need to authorize the computer, but when trying to sign in it gives me an error saying
This action could not be completed. Try again. If I choose not to authorize the computer, it threatens to delete literally all of the apps on my device.
Is there another, better way to install an app on my iPhone?