May I know from where you purchased PS CS6 upgrade from ?
Is PS CS 5.1, student version by any chance ?
You purchased just the upgrade to PS CS 6 or full suite ?
As Baljeet said, please clarify. Could be thast you simply have the wrong installer. if so, you may wish to get in touch with support. they can eitehr help you generate an install code or advise about exhanging the wrong media.
I had bought the full CS5 suite online from Adobe (boxed version) and the CS6 Upgrade from Adobe (also boxed version). Both are registered
Have decided to re-install CS5 and will then try the upgrade. Will let you know how I go.
It worked when I re-installed CS5, did all the updates. CS5 Extended showed up in the drop down menu. All fine thanks.