MEDIA CORE 8KTVSamsung Tizen uses its own signed TV application, not an Android APK.
These store steps apply after this platform release has been approved and published. There is no current installer for this platform.
Confirm that your Samsung TV model is supported by the eventual Tizen release.
When approved, press Home on the remote and open Apps.
Search Media Core 8KTV and verify the listing linked here.
Select Install, then Open.
Connect your account using the code shown on the TV.
Use the official Samsung Apps listing linked from this site. Do not use an Android APK for a different operating system.