Download Iso ((new)) | Mac Os Catalina

hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/macOS_Catalina.iso

You must create a blank DMG file large enough to hold the installer contents (approx. 10GB). hdiutil create -o /tmp/Catalina -size 10000m -volname Catalina -layout SPUD -fs HFS+J mac os catalina download iso