Apple unveiled iOS 11 and macOS High Sierra 10.13 at WWDC, and while the final versions will not be available until the fall, users who are enrolled in the developer beta testing program can download the first beta releases now.
The first beta builds give developers an early look at some of the new features announced for the upcoming system software versions for Mac, iPhone, iPad, Apple TV, and Apple Watch.
Currently macOS High Sierra is only available to paying Apple developers, with a public beta coming in July. However for those of you who want to get their hands on it right now, you can do just that. You don’t need to be a paying to developer to install and use macOS High Sierra developer preview 1. All you need is the install file and a Mac to install it on. I would however not recommend installing this as your default operating system. It is best to install it within a virtual machine or on an external drive, due to the inevitable bugs you will run into.
mac OS 10.12 or later