The new gui is only available in Patran 2010 and on.
Look at the Patran shortcut, right click>properties. You will notice an additional -skin for the new GUI.
New GUI: C:\MSC.Software\Patran_x64\20122\bin\patran.exe -skin
OLD GUI: C:\MSC.Software\Patran_x64\20122\bin\patran.exe