Very odd I have another Sharp Roku TV LC40LB601U that updated to include Apple TV app and many more. I bought the two TV's at the same time yet the LC50 is not showing any way to get the Apple TV app. Both have the same software version, 11.0.0 Is there a way to get the LC-50 updated?
What are the Roku model numbers displayed under Settings->System->About (not the TV model number)? It's possible one supports it and one doesn't.
The LC-50 is 5304X
the LC-40 is 8209X
Sorry, 5000X devices do not appear on the list of supported devices.
https://support.roku.com/article/360036652634