watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2018-07-09T17:07:44Z. The update package is 353.81 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: 654508c5f7801ef1022fccfcf838b70647b050c7.zip.