watchOS 6.0 (build 17R5566a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-08-15T17:18:47Z. The update package is 533.13 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 26085987f15333bb4f7c6003c71a61365e076fab.zip.