For training purposes, I need to install Motion 5.1.2 on my MacBook Pro. It's already installed and up to date on my iMac. I am running Mavericks on both computers. The App Store now has version 5.2.1, which requires Yosemite. I cannot upgrade my MBP to Yosemite because the classroom in which I teach is still using Mavericks with Motion 5.1.2.