watchOS 6.0 (build 17R5532f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-07-17T17:43:44Z. The update package is 690.02 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9bbaa9eabd3d3cdf30f33371ba26c5567feaa90b.zip.