watchOS 3.1 (build 14S452) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-09-21T17:00:43Z. The update package is 559.58 MB. This is a delta (partial) update that requires 2.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0a186a20a1f92502c208a0f1fe5f0081f248887e.zip.