Which means, a common reason for this error occurring might be simply the fact that multiple Apple IDs exist on your Macbook and you are trying to update the App with the wrong Apple ID. This will occur for both free and paid applications. This means only that particular Apple ID can access and update the App for you. Whenever you make a purchase for an app or download it on the App Store, that instance of the app gets linked to your Apple ID. But first, let’s take a look at why this happens.
However, do not worry, for we have methods that will fix this error for you. The message further explains the cause, something like the app ‘was bought by a different user or the item was refunded or canceled’. You might find that you are not able to update an app, and are being displayed the following message: What is Update Unavailable with this Apple ID Error? 2 Methods to Fix Update Unavailable with this Apple ID Error.1 What is Update Unavailable with this Apple ID Error?.