HT206886: How to get macOS Sierra
Learn about How to get macOS Sierra
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Helpful answers
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Dec 19, 2014 12:54 PM in response to tony.decsby Niel,Specify a blank partition or drive when setting up the installation. If needed, choose Utilities from the Finder’s Go menu and use the Disk Utility to create one.
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Dec 19, 2014 1:00 PM in response to tony.decsby Eric Root,Do a backup before doing anything.
If you want to make a clean install of Yosemite boot into the Recovery Volume (command - R) on a restart, use Disk Utility to Verify/Repair the disk and run Repair Permissions. Then erase the hard drive using Mac OS Extended (Journaled) format using the Options button. Reinstall Yosemite. Restart normally and test. Use Setup Assistant or Migration Assistant to import what you want.
I would download the installer and you can make a bootable USB stick to install using this free program. You can then install from there.
Bootable USB Flash Drive – Diskmaker X