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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.