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I'm trying to open OS X Lion 10.7.5 which I downloaded as I need to run Logic 9 music production software, however when I try and open it says that OS X 10.7 won't open it, although I'm aware that doing things in reverse like this is not always possible does anyone know of a way to open it? Do I have to uninstall OS X 10.7 completely? Is Lion just too old? Thanks for reading this.