I am just about to install Photoshop Element 11 on my Mac, using OSX operating system. However, I have an earlier version, Elements 6, already installed. Is it necessary to uninstall Elements 6 before installing Elements 11? Will there likely to be any conflicts if I leave Elements 6 on my computer before installing Elements 11? I would like to keep Elements 6 in the short term, to use, until I master Elements 11. Any advice would be appreciated.