Cubase 6.5.1 upgrade

Hi, I’m trying to update my 6.5.1 Cubase edition to 6.5.4 (the last one). The setup wizard works correctly til the end, and it shows that 6.5.4 is successfully installed.
But, when I open the program it shows that it is still at 6.5.1. !

Someone has experienced this issue ?

Problem solved, deleting manually cubase6.exe and than reinstalling Cubase.