watchOS 4.2.2 (build 15S5534a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-12-19T18:05:35Z. The update package is 84.62 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: 7244a0b3380aede457ec052086b1cc8832e682ef.zip.