watchOS 4.2 (build 15S5100a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2017-11-13T18:04:11Z. The update package is 573.37 MB. This is a delta (partial) update that requires 3.2.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0ddc75142856a63d1969025c6c4b32ff3ab1171f.zip.