May I know if this issue happen to all apps?
Did you try to update your Windows?
I suspected this issue related to regional setting since you are using N version of Windows 8.1
Check your country or region setting
Step 1: Swipe in from the right edge of the screen, and tap Settings.
(If you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Settings.)
Step 2: Tap or click Change PC settings.
Step 3: Tap or click Time and language, then tap Region and language.
Step 4: Under Country or region, look to see that your location is set correctly, and change it if it's not.
The app is no longer available in the Store
Maybe this app not available in your country
Family Safety settings or app locker might be hiding or lock apps
Contact apps developer if this only happen to spesific app
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Edited by
britishdhez
2 hours 27 minutes ago