Application is not found

Yes it’s a legit app. I never go online with any app without being behind a vpn. I prefer security and it has nothing to do with a legitimate or otherwise app. I prefer security and encrypted traffic and not having someone see my traffic, legal or otherwise.

I get tons of msgs and chats everyday. And after reading it you didn’t go thru the list nor didn’t see the pinned firestick mega guide which has that info in it. So no you didn’t search.

(I hope this it the appropriate spot for this question)
I was updating all my six “Fire TV” devices (sticks mostly) and noticed on the 2nd gen? most of the old apps that used to load, can “not be found” in Amazon app store or else where. Like Xfinity Stream, even Netflix, etc. Is this due to the older OS on the 2nd gen? I’m going to try on my 4K firestick when I get home. I know I’ve loaded Xfinity Stream on 2nd gen/older firesticks in the past. I’m read some where that it’s the app developer requires a higher OS?