I want to convert my trial version of photoshop elements that I bought and it says my serial number is not valid, but this is the exact number of my confirmation e-mail. Have you installed the special version? You must.ĬS2: Error: unavailable activation server | CS2, Acrobat 7, hearing 3. I installed photoshop cs2 with the serial number, but now, photoshop will not open because no user name or serial number correct?