Older macOS ISO files (like High Sierra or Mojave) might trigger an error stating the application is damaged. This happens because Apple's security certificates expire over time. You can bypass this by disconnecting your internet connection during installation and rolling back the system clock using the Terminal command: date [MMDDhhmmYY] .
: sudo /Applications/Install\ macOS\ [Version].app/Contents/Resources/createinstallmedia --volume /Volumes/macOSISO --nointeraction
hdiutil detach /Volumes/Install\ macOS\ Sequoia Mac Os Download Iso 64 Bit
You now have a clean, official, and fully bootable macOS 64-bit ISO file ready for virtual environments. Third-Party Downloads: Risks and Precautions
If you’ve typed into a search engine, you are likely one of three things: Older macOS ISO files (like High Sierra or
: Search for "macOS ISO 64-bit". Many tech enthusiasts upload clean, untouched ISO copies of macOS versions for preservation purposes.
mv ~/Desktop/macOS_Sonoma.cdr ~/Desktop/macOS_Sonoma.iso : sudo /Applications/Install\ macOS\ [Version]
You now have a clean, officially sourced macOS ISO 64-bit file ready on your desktop. Method 2: Download Pre-Made macOS ISO Files
Downloading a pre-made macOS ISO from a random website might seem convenient, but it carries significant dangers:
Apple does not officially distribute macOS as ISO files. They distribute them as .app installers (via the App Store) or .dmg / .pkg packages. To get a bootable ISO (often used for Virtual Machines like VMware, VirtualBox, or Parallels on Windows/Linux), you typically need to create it manually from an official Apple installer.