watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-07-03T17:11:00Z. The update package is 565.72 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: 21bbe64a6fdae58bae17180e2218d9f541304bbe.zip.