title: Best practice in upgrading from instant app to full app
body: <p>I have yet to find a clear and straight forward solution to letting the user download the full app, as he's using the instant app.</p>
  
  <p>There are docs regarding how and where to show the install button, but none tell how exactly to make the user download it.</p>
  
  <p>Should we just link to the store and let the user click Install, or is there a better approach directly within the instant app .... somehow?! Some sort of ... "one click direct install"</p>
  
  <p>Cheers !</p>