watchOS 4.1 (build 15R846) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-10-20T17:05:08Z. The update package is 548.13 MB. This is a delta (partial) update that requires 3.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c0128f0c2c11adffc15b48a95916157480e59da2.zip.