If you already have Install OS X Mavericks.app (around 5.2 GB), you can create a bootable ISO or DMG yourself.
To run OS X 10.9, your Mac generally needs to be a 2007–2008 model or newer with at least 2GB of RAM and 8GB of available storage. It was the last version to support certain mid-2007 iMacs and 2008 MacBooks. mac os x mavericks 109 iso and dmg image hot download
If you are looking to download the OS X Mavericks 10.9 installer, it’s important to get a clean, bootable image for a smooth installation. Since Mavericks is a legacy operating system, finding a reliable file can be tricky. Official Download Method The safest way to get OS X Mavericks is through the Mac App Store If you already have Install OS X Mavericks
Apple sometimes provides legacy OS links if you call support with a serial number from a Mavericks-compatible Mac (Mid-2007 to Mid-2014). If you are looking to download the OS X Mavericks 10
Once you have the .app file from the App Store, you can convert it into an ISO for virtual machines using the Terminal. This is the safest way to ensure you have a "clean" image without malware. Safety Warning for "Hot Downloads"