Since Apple launched version 12.7 of iTunes, iOS App Store access from the app has been removed.
Obviously, this change would not go unnoticed by end users and also by companies / institutions that did not have enough time to adapt. So, shortly after, she silently released a parallel version that still gave access to the store.
Today, this “old iTunes” has been updated to version 12.6.4. There is, however, no release note available so we can only imagine that it brings minor bug fixes, stability and / or security.
For those who still use it, the update is obviously recommended.