Download Later - postpone download/install until a later time, eg. when on Wi-Fi
Change the action button to say 'Download Later' with an outline style instead of the filled in style of 'download'. Selecting this flags the app to be downloaded automatically when the user is connected to the internet. A notification is sent to the user within the app in the updates view: #840 (closed)
We'll also need a state for this button after the user has selected it.