In this Widget you got everything that you need in order to keep your app updated, you can check if your installed app is outdated, and you can redirect your user to the store page of your application (App Store, Google Play).Install and check the sample app in your phone.
You can read more about why you would need this here : https://success.outsystems.com/Documentation/10/Delivering_Mobile_Apps/Mobile_App_Update_Scenarios