Apple has recently updated their iTunes version which is 12.7.It is made by a apple of retro version of iTunes available ,12.6.3 with features removed by the mammoth.ITunes 12.7 has removed from MacOS and windows the program's ability to sync apps and ringtones with iOS devices.
Apple has said this because of some business users need to use iTunes to deploy this app across their enterprise.
1.Open the App store on your Mac.
2.click updates at the top of the window.
3.Ifany MacOS or iTunes updates are available, click install.
2.From the menu bar at the top of the iTunes window,choose Help>check for updates.
3.Follow the prompts to install the latest version.