watchOS 6.0 (build 17R5532f) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-07-17T17:43:28Z. The update package is 660.37 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: ad228fe74c75f5ee506e3a9cfb24ea79380d0906.zip.