Step 2: Prepare Your USB DriveNext, 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. ![]() Quit it by pressing Command-Q on your keyboard.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. 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 Appleās licensing agreements and they may have been modified to contain malware.Once you have downloaded macOS Sierra from the Mac App Store, the upgrade installer app will automatically launch.
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