watchOS 6.0 (build 17R5556d) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-08-07T17:15:24Z. The update package is 711.52 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 877e9dfbda2a33adf34a0082eaeb12713db31f99.zip.