watchOS 4.2 (build 15S5085b) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-10-30T22:07:12Z. The update package is 233.4 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0a6bc3b140af444109ce62b5ebdd6c06c9276a37.zip.