How to get Sierra or High Sierra and can I clean install them?

  1. Assuming I have the means to download it from the Mac Store, can I download the full image of Sierra and/or High Sierra, create install media on a computer with macOS running already, and then use that media on a different, clean/wiped machine (in other words, can I install S or HS clean without having a previous macOS on the target computer)?

  2. In order to get Sierra or High Sierra, do I need a macOS environment of at least 10.6.8? Can I use any newer version of macOS to get the downloads?

submitted by /u/Espionage724
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