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Disconnect your Mac completely from the internet (unplug ethernet and turn off Wi-Fi in the top-right corner of the installer environment). Open from the Utilities menu in the top menu bar.
The Mac OS X 10.9 Mavericks Installer is hosted on the Internet Archive for those who cannot access it via official Apple channels. mavericks os x 10.9.x dmg
If you get a "damaged" error during installation, it's often due to an expired security certificate. A common fix is to set your system date Disconnect your Mac completely from the internet (unplug