I recently bought a new computer and deactivated CS6 on the old computer. I have the serial number for the CS6 software. Tried downloading the CS6 software from Adobe website. Get error message, saying the serial number is valid, but the serial number belongs to another Adobe program. Not so. Now what?
There were different editions, all of them with different serials:
Photoshop CS 6
Photoshop CS 6 Extended
Photoshop CS 6 as a part of the Creative Suite (Extended)
Did you download exactly the right version?