What might be happening in this case is that you could have your new OS set up to run in 64-bit mode. Make sure your system meets the requirements.” You have a relatively new MacBook Pro so this must be some sort of mistake…
So you pop in your Adobe Acrobat Pro 9 to install it, and you are greeted with the message, “Adobe Acrobat 9 Pro can’t be installed on this computer. You even opened up more of your hard drive after the installation! Good thing you just bought some software to fill up that space.
You rushed home and installed that shiny new OS on your Mac and it runs like a dream. So, you have yourself the fancy new Apple operating system, Snow Leopard, and you also bought yourself a few software titles.