watchOS 5.0 (build 16R5303d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-06-19T17:36:44Z. The update package is 266.44 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 12c42b0e48cf1d4d42371b9e8184f1d5cf85f4a3.zip.