Apple on Wednesday seeded the second beta of macOS High Sierra 10.13.5 to public testers. Those in Apple’s beta program can download the new beta through the Updates tab in the Mac App Store.
Apple has seeded the second betas of iOS 11.4 and tvOS 11.4 to public testers. Those in Apple's beta program can install the updates using each platform's respective over-the-air update mechanism.
Apple has made the third betas of upcoming iOS 11.3 and macOS High Sierra 10.13.4 updates available to public testers. Those in the Beta Software Program can download the updates from Apple’s website, or via their respective over-the-air update mechanisms.
iOS 10.3 beta 3 with Find My AirPods and other enhancements and macOS Sierra 10.12.4 beta 3 with Night Shift Mode and other perks are both now available for public beta-testing, assuming you've enrolled in Apple's Beta Software Program. After signing up on the web at beta.apple.com, deploy a special configuration profile on your iPhone, iPad, iPod touch or Mac and you'll be able to install the latest beta over-the-air via Apple's standard Software Update mechanism.
Apple today released a second beta of an upcoming iOS 10.1 software update and a third beta of an upcoming macOS Sierra 10.12.1 software update to non-developers who are enrolled in the official Apple Beta Software Program.
Both macOS Sierra and iOS 10.1 public betas can be downloaded over-the-air through Apple's Software Update mechanism on devices enrolled in the beta program. iOS devices must have the proper certificate installed to run public betas.