Once you have successfully created your bootable USB installer using either method:
Use this if you need to wipe your drive or install Sierra on a different Mac. Apple Support Prepare USB : Connect a USB flash drive (at least 12GB) and use Disk Utility to format it as Mac OS Extended (Journaled) with the name Run Terminal Command : Open Terminal and paste the following command:
Note: If you are looking for an ISO file for virtual machines (VMware/VirtualBox), you may need to convert the DMG file or download a pre-converted ISO, as explained in this tutorial video . 4. Preparing the InstallOS.pkg (Extracting the Installer) download macos sierra 1012 dmg file install
Double-click the downloaded file to mount the disk image.
Apple provides older installers via their support website. Depending on your current operating system, this might download directly as a .dmg or as an .pkg installer that places the "Install macOS Sierra" app in your Applications folder. Method 1: The Official Apple Support Link Once you have successfully created your bootable USB
Apple officially released macOS Sierra 10.12 in September 2016. It introduced Siri to the Mac, brought Universal Clipboard, and offered optimized storage. If you need to revive an older Mac, set up a virtual machine, or test legacy software, you still need a clean macOS Sierra installation file.
Double-click the downloaded file to mount the virtual disk image onto your desktop. Preparing the InstallOS
If you hit a roadblock during any part of this setup process, tell me: What are you seeing? What is the exact model and year of your Mac?
and immediately hold down the Option (Alt) ⌥ key. Select the USB installer from the boot menu.