HT201250: Use Time Machine to back up or restore your Mac
Learn about Use Time Machine to back up or restore your Mac
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Sep 22, 2015 12:50 PM in response to Johndbarkerby lllaass,Go to the Purchases section of the Mac App Store and download the Maverick's installer. Note it is only available if your previously downloaded it.
The make a booted USB installer using
Then boot from that installer and format the startup disk and install Mavericks