**Sierra is not advertised on the Mac App Store any longer. It's available but hidden.
To find it, check out this video:
   • How to Find Mac OS X Sierra in the Ap...  

**Check out our latest video for Mac OS Mojave 10.14 at:
   • Create a Bootable Mojave USB Installe...  

**Check out our updated video for Mac OS X High Sierra 10.13 at:
   • Create a Bootable USB High Sierra Ins...  

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 redownload 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). 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

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