Start your computer and point your mouse to the Store icon. This will open the Windows Store for you. Make sure that you have a working internet connection and a Microsoft account signed up in order to be able to use the Store.
A new window will appear on your screen, you will have to right click on the white space and the context menu will appear.
From the context menu select your app.
A list of apps which you have previously purchased from the store will be displayed on the screen. You can switch from all apps and see which app is installed on a particular device. This will help you in viewing the apps installed in the specific device.