tvOS 13.4.5 (build 17L562) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-05-20T17:07:49Z. The update package is 138.24 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 82fd0074a41ac68fc0cfba71ce3dac5a5e5fc800.zip.