watchOS 4.2 (build 15S5085b) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2017-10-30T22:07:04Z. The update package is 563.05 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: a17b318659738d6d67182c72a789f0e6b2c4ba73.zip.