watchOS 5.2 (build 16T5225a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-03-18T17:16:14Z. The update package is 495.08 MB. This is a delta (partial) update that requires 5.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ef1b105c92d604968632e430f05aee915c105319.zip.