How to download macOS Sierra 10.12.2 beta 3 to your MacIf you are a developer and want to know what to expect in macOS Sierra, here is how to install the developer beta
Update November 14, 2016: Apple has just released macOS Sierra 10.12.2 beta 3 for developers. If you already have the macOS Sierra beta installed, head to Mac App Store > Updates and download away. If you've been waiting for beta 3 to get started with macOS 10.12.2, keep reading and we'll walk you through the setup!
macOS Sierra is coming this fall with plenty of awesome new features that developers can take advantage of in their apps; as such, Apple is releasing early beta software so that developers can make their apps work seamlessly when the full operating system launches to the public.
Apple occasionally offers updates to iOS 10, watchOS 3, tvOS 10, and macOS Sierra as closed developer previews or public betas for iPhone, iPad, and Mac. (Sadly, no public betas for the Apple Watch or tvOS.) While the betas contain new features, they also contain pre-release...
Source:
How to download macOS Sierra 10.12.2 beta 3 to your Mac