Run sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled.If the image is not mounted automatically, double-click the file you just created to do it.In the "Size" field, enter 13 GB and save it wherever you want. ![]() Click on "File" > "New Image" > "Blank image.".If the High Sierra Installer starts, quit it.On macOS, download the High Sierra installer (even if you have Mojave installed):.But if you are curios how to do everything manually to install High Sierra, then this guide may be useful.Īfter reading a few articles I ended up with these steps: There is already a script which installs Mojave in a virtual machine here. Important: I'm writing this when the last version of macOS (and the one I have installed) is Mojave.
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