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Once you have the .app or .dmg installer, you’ll need a to make a bootable tool: Download the "Install OS X Mavericks" app. mac os x mavericks 10.9 iso and dmg image download
If you have a DMG file but need an ISO for a virtual machine, do not download a shady ISO from a random site. Convert it yourself using macOS Terminal. Mac OS X Mavericks 10