watchOS 4.2.2 (build 15S5534a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-12-19T18:05:33Z. The update package is 182.21 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: c4a69cd3d7cff733731c75b610d98d4bdbbadc60.zip.