watchOS 5.3.3 (build 16U620) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-29T17:09:37Z. The update package is 51.82 MB. This is a delta (partial) update that requires 5.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b057f7c99b414ea0b0f93ee0141d80a14c93b10e.zip.