Please help me !

Hi I bought Cubase 6 a year ago finally today installed it put my activation code and everything is great but in 10 minutes I got an e-mail from Cubase saying i can upgrade to Cubase 7.5 for free ( Grace period ) so I did and Now either 6 or cubase 7.5 doesn’t start its asking my activation code. When i put the code it says You used this code. I just don’t get it. i don’t understand Im gonna start crying and no one will stop me !

HELP ME PLEASE !

What does the license say in eLicenser Control Center? You should not need to enter an activation code if the license is already there… Please describe exactly what you are experiencing.