To receive an app update, you need to do the following.

  1. Restart the app. You can do this by clicking on "Home". Then click the "Multi-task" button to display the running programs
  2. Swipe the Kitchen Display. Read a Wikihow article on how to do this. 
  3. Start the app again by tapping on the Kitchen Display icon. 

You should get an alert that asks "Do you want to upgrade now". Tap on "Yes". See the screenshot below for an example.