This is possible via the Terminal App from a command Apple introduced since OSX Lion, called createinstallmedia, all you need is the original macOS Sierra app installer and a spare external drive to make a copy of the new OS installer on which you will be able to boot from. This guide deals with how to make a bootable USB disk of macOS Sierra, see this guide for older operating systems OSX 10.11 El Capitan, 10.10 Yosemite or 10.9 Mavericks.
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