This could be firewall blocking access to specific websites/web resources (like i Tunes trying to download something from Apple’s servers).
On Mac On Windows Community Q&A This wiki How teaches you how to update the i Tunes application on Mac or Windows.
Assuming you keep i Tunes on the default setting and let the app manage your music files and songs, i Tunes will store all of your media nicely in the Music directory of your home folder, with each song kept in a folder according to the album and album artist.
Though you’ll usually never need to directly access those files directly, if you’re looking to move your i Tunes library to another location or external hard drive, back up your music manually, or make edits to songs directly, you will need file system access to the i Tunes music files on your computer.
i Tunes is an audio and video player that lets you manage your i OS devices as well as download content from the i Tunes store and use Apple Music.
It's an all-in-one home for your music and video, although it's music where it really excels.