I have Adobe Photoshop CS5.1 Extended installed and activated on my system. The installation for the upgrade from disk for CS6 extended doesn't recognize that the CS5 Extended installation exists or accepts its serial number and I can't proceed. It also doesn't give me CS5 Extended as an option in the drop down menu for previous installations. CS5 shows as being activated on my computer. I did have to do a full system restore to a new hard disk some six weeks ago when my C drive crashed.
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.