Woops, I accidentally upgraded to Yosemite with my NS7II. What should I do?

Hi so I just got my NS 7II. However I'm using an older (2008) macbook pro with OS 10.10 How can I use the controller since there is no drivers for this OS? I don't know how to down grade as 1. Im not really a tech guy, and I don't want to have my computer crash while trying to use this controller for the first time. Any help/ guidance is greatly appreciated!!!
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