I'm getting a message "You can't open the application 'Parallels Desktop' because it is not supported on this type of Mac." when I try to run Parallels Desktop after upgrading to OS X Mavericks. I imagine I have Parallels 7 but I'm not sure. How can I find out? I saw the note that said you can upgrade from version 7 to version 9 if you upgrade prior to installing Mavericks. Too late - I've already installed Mavericks. Can I still upgrade?