The app can be updated on the Microsoft Store in the following way:

1) Open the Microsoft Store app

2) Click on the Library icon in the lower-left corner

3) Click on the Get Updates option

4) Find Magic Puzzles in the list of your apps and click on the Update option

The instructions are also here:

https://support.microsoft.com/en-us/account-billing/get-updates-for-apps-and-games-in-microsoft-store-a1fe19c0-532d-ec47-7035-d1c5a1dd464f 

In order to turn on automatic updates:

https://support.microsoft.com/en-us/windows/turn-on-automatic-app-updates-70634d32-4657-dc76-632b-66048978e51b#ID0EBD=Windows_10