Apple has released the fourth developer betas of iOS 11.4.1, tvOS 11.4.1, and macOS High Sierra 10.13.6, as well as the third developer beta of watchOS 4.3.2.
Registered developers can download them via Apple’s developer portal (https://developer.apple.com/account/#/welcome). Or they can be downloaded over-the-air once the proper configuration profile has been installed from the Developer Center.
