STEPS
TOOLS
Please note:  1)You must have already downloaded the app from the App Store in order to do this. Not all apps show up, for example I couldn't find App Gratis
Open the App Store!!!!
Tap on Updates then on Purchased
Search for the app in your Purchased history
Enjoy it
The creator of this guide has not included tools

How to download apps that are no longer in the app.store

Download Apps That Are No Longer in the App.Store