Within OS X Utilities, choose Reinstall OS X. Prepare a clean external drive (at least 10 GB of storage). The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Install older OS X onto an external drive. If your non-startup drive has any other Mac OS, erase it before installing Sierra. Simply use an extra drive or volume (it doesn’t have to necessarily be empty already, you just need to be fine with it being erased) and install Sierra there. So, this is the easiest way to clean install macOS 10.12.
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