I Need your help, can you read and help me? Thank You

I purchased a macbook pro retina in December 2014 , Yosemite original . I need instead of Mavericks 10.9.5 to use protools 10. I do not know how to download the installer of mavericks . My girlfriend has a macbook pro retina instead of 2013 with Mavericks . I might download to you by your computer the installer on a USB 16-gigabyte , but we do not know where to find the installer of mavericks on his computer . Can you help ?

Either connect a regular external drive to the older MacBook Pro or use the Disk Utility to partition the new one's internal drive, connect the two computers through FireWire or Thunderbolt, restart the new one with the T key held down, start the older one from the recovery partition(press the Command and R keys at startup), and install the OS.
If you're actually able to download the installer from the Mac App Store, you can use it instead of restarting from the recovery partition.
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