Install Yosemite along side El captain

My friend has a Macbook Pro of the retina not and currently El captain has installed. Her school then to use called LockDown browser software preventing him from cheating on quizzes online, test etc. He however; is incompatible with El Capitan, so she has to downshift. My question is, is it possible to repartition the drive and install a version of OS lower alongside El Captain like Yosemite? or should I just go the traditional manual way and wipe everything and do a fresh install of Yosemite. My reason for wanting to do it is because it has a 500 GB drive which is almost full, so it would be easier to have to back up your files, I can leave this partition in tact and whenever it requires the software of her school she may just start in Yosemite.

Thank you

On the model of Mac, it is possible. Back up the data anyway; the computer's internal reader will fail eventually.

(138611)

Tags: Mac OS & System Software

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