If you have the .dmg installer file from Apple but need an .iso format for VMware or VirtualBox on Windows/Linux, you must convert it.
Sierra brought several innovations that would become macOS standards:
After creating the blank image, mount it and restore the installer contents onto it using the createinstallmedia command: mac os sierra 10.12 6 iso download
Once you have the in your Applications folder, you can use the built-in Mac Terminal to create a bootable ISO file.
For a visual walkthrough detailing how to download legacy installation assets securely, check out this guide: Step-by-Step: Build Your Own macOS Sierra 10.12.6 ISO If you have the
Choose "macOS 10.12" as the operating system type.
macOS Sierra (10.12.6) was the final stable update of the Sierra cycle, released on July 19, 2017. While it is now considered a legacy operating system and no longer receives security updates, it remains a common choice for older hardware or virtual machine environments. macOS Sierra (10
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The finished Sierra.iso file will appear on your desktop, ready for use in virtual machines or as a bootable installation medium.
This process places the actual into your Mac's /Applications folder.