watchOS 4.2 (build 15S5085b) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-10-30T22:07:14Z. The update package is 148.51 MB. This is a delta (partial) update that requires 4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7a43bbe0f3edc353b45a3b61072927c376dc2658.zip.