Apple offers Volume Purchase Programs and Apple Configurator on Mac to help enterprise environments manage and mass-deploy apps on iOS devices. But certain business partners might still need to use iTunes to install apps.
Install apps with iTunes
If you've already installed a newer version of iTunes, you can download this version of iTunes on your Mac, PC 32-bit, or PC 64-bit1 and run the installer. After installation is complete, you can continue to deploy apps with iTunes.
You won’t be prompted to download new versions of iTunes after you install this version. Manually update to the latest version of iTunes when you're ready to upgrade.
1 Apple provides technical support only for the latest version of iTunes.