watchOS 5.0 (build 16R364) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-09-12T19:18:20Z. The update package is 724.53 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 58c9ff36d1cc0ed3c3d3f67bb66abf9083dd2ea7.zip.