I'm still using iTunes 220.127.116.11 on High Sierra because I like downloading all my updates ONCE instead of on every single device. Apple Books recently showed in need of an update in iTunes, but when I try to download the update, I receive the following error: Anyone else seen this? I can no longer seem to find it in the App Store and my devices don't show it needing an update. Looks like I may finally update OS when Catalina comes out, but I really do wish they kept the App Store update feature around. I simply don't understand how it's easier to download the same thing across multiple devices. It just doesn't make sense.