The apps downloaded from Microsoft Store in Windows 10 are always available for installing at any time. This becomes useful when you reset or reinstall Windows 10.
Here is how to access them for installing again:
Open Microsoft Store from the Windows 10 menu.
Click on the dots icon at the top-right and select Purchased.
All the apps that were downloaded and installed at any point of time before will be listed. Purchased doesn’t mean they are paid apps, even the free apps if they were downloaded earlier and then removed will be listed here.
Choose the apps from the list that need to be installed again and click on the Install button.
The selected app will be downloaded and installed.
You can also choose to prevent an app from being displayed in this list. To do that, click on the dots next to the Install button and then click on Hide.
All done.