watchOS 5.2 (build 16T225) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-03-27T22:04:30Z. The update package is 438.22 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 58c4b86c4d2da2e9df35b3b5e07c9f14ac9d0020.zip.