How can I downgrade to El Capitan in Yosemite? Driver problem.

I bought a Macbook 2013 used pro with El Cap installed. My midi controller has no driver for OS 10.11 not yet and I need to work. How can I get a downgrade in Yosemite?

You back up your installation of Yosemite before deleting?

Tags: Mac OS & System Software

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