Once the download is complete, open Terminal and follow these steps to create a blank disk image that will eventually become your ISO.
For virtual machines on Windows/Linux, you need an ISO. For a real Mac, you don’t. mac os iso image download
You now have a clean, official macOS ISO image in your current directory. Once the download is complete, open Terminal and
First, a reality check.
Apple’s official support pages. For example: Once the download is complete