watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-07-17T17:11:22Z. The update package is 661.18 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 52a4978dd39d93ed6e035a7b2236037572c878f7.zip.