Now click the ‘Purchase’ option to open the list of apps you’ve previously downloaded. To do so, you need to open your App Store and click on your Account icon, located on the top right corner. However, If you have downloaded the game in the past, you have a chance to re-install its Chapter 2 – Season 3 (v13.40).
Now that Apple has removed Fortnite from the App Store, you cannot install it onto your iPhone or iPad.