I have MacBook Pro from late 2011 era which I recently upgraded to Yosemite from Mountain Lion. But unfortunately I need some application that only worked on Mountain Lion and I cannot restore back to Mountain Lion as I did not have backup. Now is it possible to install Mountain Lion on USB disk from which I also boot from without actually installing on my MacBook AIR Samsung SSD drive ( the only drive on the system) on which Yosemite is installed and running?
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