HT204448: About the OS X Mavericks v10.9.2 Update
Learn about About the OS X Mavericks v10.9.2 Update
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Helpful answers
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Mar 15, 2014 8:27 AM in response to ALazo07by Barney-15E,Depends on your Mac. If it is one of the newest models, no.
If it is older, you can download the installer and create a USB installer: http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install -drive.html
Or, just Boot into Recovery, use Disk Utility to erase the drive, then reinstall the OS: