watchOS 4.1 (build 15R5835d) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2017-10-09T17:04:58Z. The update package is 156.07 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c398def955490630d1f793910373389af3589b9f.zip.