watchOS 5.0 (build 16R5283q) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-06-05T09:53:08Z. The update package is 585.66 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: 1c27d89106ca5f5effd33f533701ae7f94263bae.zip.