watchOS 5.0 (build 16R5360a) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-08-24T17:13:50Z. The update package is 610.49 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: 4a55c071007689f265cc5989e1fa02a5eb031862.zip.