Having the same problem. My old laptop died so I'm using a different one I got from my son. Installed Photoshop CS4 and it says my serial # is invalid. I've had this software for 6 years or so without any issues. The customer service chat person says my serial # is invalid. How can it be invalid now when it has always been valid for all these years? Did my serial # just change it's mind? lol This is very frustrating!!!
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