You might wonder why anyone would install a decade-old OS. Here are four practical reasons:
Mavericks_10.9.5_Official.dmg
├── .VolumeIcon.icns
├── Install OS X Mavericks.app
│ ├── Contents/
│ │ ├── MacOS/ (installer binary)
│ │ ├── Resources/ (license, graphics)
│ │ └── SharedSupport/
│ │ ├── BaseSystem.dmg
│ │ ├── BaseSystem.chunklist
│ │ ├── InstallESD.dmg (or symlink)
│ │ └── Packages/
├── legacy_software/
│ ├── Optional_PostInstall_Apps/
│ └── Security_Updates/
└── README_Troubleshooting.rtf
The "x" represents sub-versions. The final and most stable version is 10.9.5 (Build 13F1911). If you find a DMG labeled 10.9.0, you will need to manually download the 10.9.5 combo update later. mavericks os x 10.9.x dmg