watchOS 5.0 (build 16R6364) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-09-12T19:19:16Z. The update package is 360.1 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: fc599c4f9b4f20836d946ce363583ef2899c1aec.zip.