About upgrade???

Please, help me! Can I still upgrade my Cubase SL3 to Cubase5 or Cubase Studio5?
Or, can I upgrade Sl3 to Cubase 6 or Cubase Artist6?
Thanks in advance!

I guess this question has been answered already in another post…

http://www.steinberg.net/forum/viewtopic.php?f=20&t=6671