Photoshop CS6 serial number corrupted?

I purchased a student/teacher licensing copy of CS6 while in art school in 2012, and have had it installed on my macbook ever since, but I'm switching to a new laptop and am having issues reinstalling it now. I can install the software from the discs but can't activate it, when I enter the serial number I have registered on the Adobe site I get the error that "serial number is invalid". Support tried to activate the software via remote access but still no dice, so I was directed to post the issue here.

I'm just looking to reinstall & activate Photoshop. I don't know what to do, the serial number I have is valid, so I assumed I would be able to reinstall on a new system with no issues.