watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-07-09T17:08:15Z. The update package is 146 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b6791f22be214064e146b8ded1bea9aea8de4967.zip.