Unmount the volume and convert the DMG file into a CDR format, which is functionally identical to an ISO:hdiutil detach /Volumes/Install\ macOS\ Sonomahdiutil convert /tmp/macOS.dmg -format UDTO -o ~/Desktop/macOS.iso

When you download macOS from the official Mac App Store, it comes as a .app bundle (Installation.app) or a .dmg disk image. Apple designed macOS to run exclusively on Mac hardware, so they don’t cater to users trying to run it on a generic PC or hypervisor.

Once the installer is in your Applications folder, follow these steps in Terminal to convert it: Create a blank disk image:

Bootable USBs: While the "createinstallmedia" command is preferred, some Windows-based tools like Rufus or BalenaEtcher require an image file to create a bootable Mac drive.

This is the #1 reason. Users on Windows or Linux often need to test websites or apps on Safari, or develop software for the Apple ecosystem without buying a Mac.

Yes, but only via virtualization (VMware/VirtualBox). Direct installation (Hackintosh) requires extensive tweaking and hardware compatibility. Both are against Apple’s EULA.

hdiutil create -o /tmp/macOS -size 16000m -volname macOS -layout SPUD -fs HFS+J Mount the image:

Why are so many people searching for ? The primary reasons usually fall into three categories:

| Risk | Consequence | |------|-------------| | | You get an older macOS that may not support your hardware or software. | | Malware | Keyloggers, crypto miners, or ransomware embedded in the ISO. | | Modified system files | Unstable Hackintosh or VM crashes. | | No verification | No checksum to verify integrity. | | Legal exposure | Downloading from unauthorized distributors can trigger ISP warnings. |