MacOS AppStore Updates screen. When you click "more" it displays a modal dialog which ... just repeats the same text. There are no obvious ways to dismiss it (you have to click outside the modal).
Moreover, once the update is downloaded, the "more" link/button no longer works. It just sits there, and you can click it, but nothing happens.
To quote Apple's own guidelines :
Minimize the use of modality. Generally, people prefer to interact with apps in nonlinear ways. Consider creating a modal context only when it’s critical to get someone’s attention, when a task must be completed or abandoned to continue using the app, when a task calls for modality (such as using a drawing or selection tool in a graphics app), or to save important data.
Provide an obvious and safe way to exit a modal context.