watchOS 3.1 (build 14S464) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-10-04T17:25:17Z. The update package is 569.57 MB. This is a delta (partial) update that requires 2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7f4a390f7557f63846cf734efeb2eee41d781553.zip.