watchOS 6.0 (build 17R575) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-09-11T18:34:58Z. The update package is 1.09 GB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9c9caefadd04b5808bc7c82fb734a882f31cf8ad.zip.