watchOS 3.0 (build 14S5302d) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-08-01T16:47:43Z. The update package is 927.16 MB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 26031382818e2891148a92043160e78610722800.zip.