watchOS 4.1 (build 15R5846) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2017-10-20T17:03:59Z. The update package is 46.2 MB. This is a delta (partial) update that requires 4.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a78a0a18ec28ab03d16e27c9614b5737ad3eafd7.zip.