Apple has released iTunes 12.6.3, an update to application for those customers who still want or need access to iOS App Store:
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.
If you don’t need this, iTunes 12.7 is still the version you want. Apple notes that it will not provide technical support for this version of the app, which I find kind of funny.