watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-07-17T17:11:17Z. The update package is 690.01 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d4742a97bb69a10be5ff934c519638ba2eea6809.zip.