watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-07-09T17:08:10Z. The update package is 331.83 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4a33a43822256a86b79e4264e370fa7b0f06b4ef.zip.