If you’re already running the watchOS 3 beta, you can grab beta 2 from inside the dedicated Watch app on your iPhone. If you’re trying out watchOS 3 for the first time, you’ll need to head to Apple’s developer center first. watchOS 3 brings some huge improvements to the Apple Watch. That includes instant launching apps, a new app dock you can open by pressing the side button, a new SOS feature, a special Breath app, a scribble feature for writing messages with your finger, fitness-tracking support for wheelchair users and more.
If you’re eager to try out the latest version of tvOS 10, you can download it from the Software Update page on your Apple TV. If you’re downloading the beta for the first time, you’ll have to do it through the Developer center. The latest beta introduces a new design for Apple Music on Apple TV, according to 9to5Mac. tvOS 10 also adds Dark Mode, HomeKit controls, Single Sign-On for easily logging into multiple accounts and more.
Finally, macOS 10.12 beta 2 is available for registered Apple developers through the Software Updates section in the Mac App Store or from the Apple Developer Center. The new desktop operating system includes a bunch of improvements, most notably Siri support. The latest beta also adds Auto Unlock, making it possible to log into your Mac using your Apple Watch instead of typing in a password.