only 4g and 4k appletv's has app stores
the 2 and 3generations don't have storage for apps
The 3rd Gen is discontinued, there hasn’t been any firmware update in a long time (latest is 7.2.2). IOS 11.2 is only for IOS devices and the latest Apple TV‘s (4th gen and 4K) run a completely different system (TVOS) which is what just updated to 11.2 as well. The App Store is based on that platform, which requires the newer hardware.
Question: why i can’t see the app store on my Apple TV 3th gen with ios11.2?