watchOS 4.1 (build 15R846) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-10-20T17:04:59Z. The update package is 785.47 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: dd2e5428402c7cac5125a86bb702006b62adb31a.zip.