watchOS 2.0 (build 13S5344) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2015-09-21T17:58:03Z. The update package is 269.67 MB. This is a delta (partial) update that requires 2.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 51aa56fbc0b8a49b88dc9dff4d62b2d3a701d05e.zip.