The only apps that can be installed on a Roku device is what is available in the Roku Channel Store. You cannot install APK files because those are for Android, and Roku uses a heavily modified version of Linux. There's no known way to install 3rd party apps on a Roku. You cannot "jailbreak" a Roku device.
There used to be a way to install "private" channels, but Roku did away with it because too many were used for viewing content illegally.
Dan
Roku Community Streaming Expert
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