watchOS 6.0 (build 17R6575) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-09-11T18:36:53Z. The update package is 561.36 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 5f41b926616deb3ad5b8ef6f23a2c7f1a191bb13.zip.