watchOS 5.0 (build 16R5360a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-08-24T17:14:21Z. The update package is 297.35 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: f25bbf6868d85089a2725d30cf1e430ab07f188d.zip.