Make sure that you don’t have any important files on this drive as we will be wiping the drive before creating the installer. Next, grab a USB 2.0 or USB 3.0 drive that is at least 8GB in size. As of the date of this tip, the name of the macOS Sierra Developer Preview installer is Install 10.12 Developer Preview.app.

Now check your Applications folder to verify that you have the Developer Preview installer, as the instructions for creating the USB installer are dependent on the name of the installer application. Quit it by pressing Command-Q on your keyboard. Once you have downloaded macOS Sierra from the Mac App Store, the upgrade installer app will automatically launch. It is still possible to obtain and install macOS Sierra if you are not a registered developer or beta tester, but be wary of using installers obtained from sources other than Apple, as using them is a violation of Apple’s licensing agreements and they may have been modified to contain malware. Registered developers will receive a Mac App Store redemption code for macOS Sierra via the Apple Developer portal. To create a macOS Sierra USB Installer, you first need to download the operating system from the Mac App Store. Step 1: Download the macOS Sierra Installer from the Mac App Store Note that these instructions will vary for the Public Beta and eventual final version of macOS Sierra, and we will provide updated instructions for these versions as they are released. Here’s how to create a macOS Sierra USB Installer for the Developer Preview. While Apple makes installing macOS Sierra easy via the Mac App Store, some users prefer to create their own USB installers that can be used to upgrade multiple Macs or install macOS from scratch on an empty drive.

The macOS Sierra Developer Preview is here and will soon be followed up with a Public Beta later this summer. How to Create a macOS Sierra USB Installer for the Developer Preview

10.12 developer preview download