You can download the Oreo Tv app from the link provided here in this article. You won’t get this version of Oreo tv apk from any official authority store as it is a modded version. Hence, you can’t download this apk for your phone from the google play store.
Similarly, The Oreo tv app for iOS is provided here in this article. You can visit the given link for downloading the app on your device. You won’t get this app from the official source as it is a modded app.