Re-use Mavericks install file I have three Macs I want to upgrade to Mavericks.  Is there a way of re-using the install files, so I don't have to do three separate 5gb downloads?
Download the update from the App Store. Once the file has finished downloading, check your Applications folder for the "Install OS X Mavericks" icon. Copy this installer to your other computers before going through the install process. The installer will delete itself after the install is finished.