tvOS 13.4.5 (build 17L5553c) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-04-29T17:13:58Z. The update package is 127.64 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: 3d4cac12b32d56f4e37c7af707bb9d382958421d.zip.