I just have the Adobe Photoshop CS5 Extended Edition. I installed it on my computer, and when I put the serial number, it works, but when I tried it with other key it said that the code is incorrect, and asked me for another. It is just not working for me. I do not know what is the exact problem. I think this might be a installer problem or something like that. Though i am not sure about this. Any help on this is appreciated. Than you.