watchOS 5.0 (build 16R5363a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-08-31T17:15:28Z. The update package is 221.45 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: 53957d0d5a69b3267ca436eede2ae0ff144ac61d.zip.