.Sierra is not advertised on the Mac App Store any longer. It's available but hidden. To find it, check out this video:.Check out our latest video for Mac OS Mojave 10.14 at:.Check out our updated video for Mac OS X High Sierra 10.13 at: This video shows you how to create a bootable USB Flash Drive Mac OS X Installer. You will be able to boot most Macs from it and then install Mac OS X 10.12 Sierra without needing to re-download the installer for each Mac. You can also use it to format the internal drive of a Mac using the built in Disk Utility, this is also covered in the video. You will need a 8GB or larger USB Flash Drive (aka USB key).
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Make sure it's empty, because you'll be deleting everything on it during the process of making the installer. You will use a command in the Terminal. Make sure you type it correctly, or you will get an 'unknown command' error. Here is the command for your reference: sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/SierraBootInstall -applicationpath /Applications/Install macOS Sierra.app -nointeraction &&say Done If you have any questions or suggestions for new tutorial videos you would like us to post, please put them in the comments below. If you would like to arrange one-on-one help or remote help, please contact us through our website at.
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Upon completion of the USB formatting, locate Install Mac OS X Mountain Lion.app (downloaded in step #1 to the Applications folder, by default). Right-click the file and select Show Package Contents. To install OS X Snow Leopard from the USB drive, you'll need to reformat the Mac's hard drive. To do this, look towards the top of the screen and click on Utilities from the top menu and then click Disk Utility from the drop-down menu.