watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-07-09T17:08:17Z. The update package is 370.9 MB. This is a delta (partial) update that requires 4.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ba4b243a9f6e953ed466deec329c81656ca0dd1b.zip.