How to reinstall this app

Open the Microsoft Store app and log in using the same Microsoft account you used to purchase the app.
Search for the app you want to re-download.
Instead of the “Buy” button, you should see a message indicating that you already own the app and that you can install it.
Click on the “Install” button.
You will not be charged again to re-download apps you have already purchased as long as you are logged in using the same Microsoft account (this step is very important).
All app downloads and reinstalls are managed by the Microsoft Store. If you need additional help reinstalling this app, please contact Microsoft Support.

Official support page from Microsoft:
https://support.microsoft.com