cannot download macOS High Sierra 10.13
I want to make a startup disk from MBP with touchbar for old iMac 2011, but cannot download from the App Store (via https://support.apple.com/ko-kr/HT201372). Where else, if this is not the right place?
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You must be running High Sierra or earlier to download High Sierra and create an installer.
https://discussions.apple.com/docs/DOC-12081
explains how to get the download.
https://diskmakerx.com/ is a tool to create that install disk.
Alternatively, you can also create a clone on an external hard drive once you verify it can boot it.