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To obtain a ISO or DMG image, the most secure and official method is to first download the full installer app directly from Apple and then convert it yourself using Terminal . Apple does not typically provide standalone full installer DMG or ISO files for direct download . 1. Download the Official macOS Catalina Installer
# Create a blank disk image hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J # Mount the blank image hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina # Use the Apple 'createinstallmedia' tool to flash the installer to the image sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction # Unmount the volume hdiutil detach /Volumes/Install\ macOS\ Catalina # Convert the DMG to an ISO (CDR) hdiutil convert /tmp/Catalina.dmg -format UTOI -o /tmp/Catalina.iso # Move to Desktop and rename to .iso mv /tmp/Catalina.iso.cdr ~/Desktop/Catalina.iso Use code with caution. System Requirements for macOS Catalina download macos catalina 10.15 iso and dmg image
"In the end," she said once, "we're preserving choices." macOS Catalina (10