watchOS 5.0 (build 16R5283r) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-06-11T17:06:51Z. The update package is 546.89 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b1879343ab304f3cb032e5e3d4437c9e8d917e54.zip.