Here's a strange one. I do updates for iOS apps through iTunes all the time. Recently I had an app that updated fine on my iPhone 6s but when I tried to download the update in iTunes it failed. Now it's happened a second time which is odd. I deleted the app from iTunes and tried to re-download from the app store but get the same error. Seems that it can't find the app due to an issue with the URL. The app updated ok on the iPhone, so it seems odd the URL issue is restricted to iTunes app on my MacBook Pro only. Any ideas on this one?