Hello,
You could do a system restore using a restore point dated when you still had the app installed to restore it like in the tutorial below.
https://www.eightforums.com/threads/system-restore-how-to-do-in-windows-8.4692/
If that's not an option, then you could restore a system image that still had the app installed. Otherwise, you should be able to manually reinstall the app as usual.