We already consider ES File Explorer to be the simplest way to sideload APKs to Android TV, but we didn’t realize our old approach was actually the complicated one.
You see ES File Explorer lets you send files from one device with the file manager installed to a second one that also runs the app. This means downloading ES File Explorer to both your phone or tablet and the TV you want to transfer an app to.
PSA: Easiest Way To Install APKs From APK Mirror On Your Android TV? Favorite The Site In ES File Explorer’s Built-In Web Browser was written by the awesome team at Android Police.
Source: Andriod Police