watchOS 4.2 (build 15S5090c) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2017-11-06T18:03:08Z. The update package is 70.23 MB. This is a delta (partial) update that requires 4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9b2033d93b5f2d3b979f66e981a880e56a3dab46.zip.