Can You Install Apps on the Apple TV?

If you have the 4th generation Apple TV or later, you can download Apple TV apps from the App Store. The first three versions didn't allow this.

Can I install apps on the Apple TV from my iPhone? - Quora

Purchase and download apps on Apple TV - Apple Support

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How to Add Apps to Apple TV

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Control Apple TV with iOS or iPadOS Control Center - Apple Support

How to add your favorite streaming apps to an Apple TV