Right click the bootable disk image file (*.Once you have the bootable disk image file from Parallels (yeah, unfortunately you need Parallels for this but you can use a free trial if you do not have a license) you can convert this into a DMG file like so: ![]() Again, these instructions are intended for new internal SSDs only, with computers that have already had their original drive upgraded to macOS 10.13 High Sierra. Parallels will then prompt you to create a bootable disk image file (*.hdd format). If the original drive was not upgraded to High Sierra, that should be done first so the internet recovery feature on the computer is updated to High Sierra. Just choose "Install Windows or another OS from a DVD or image file" and then select the installation image. It will start downloading in the Settings app this is expected.Īlthough you obviously won't be able to run the installer from a newer macOS, you can create a virtual machine easily as Parallels will offer to install the OS for you. ![]() Here are the links to a few recent versions: It turns out you can still download macOS versions from the App Store, using direct links, even though it's not visible in the Purchased section any more (probably requires previous purchase, but not sure).
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