I need a 24 digit serial but only have 20??

PLEASE HELP:
i have a older mac pro (2011) that has photoshop cs5.1 on it. I have recently upgraded to a new mac pro and i wanted to install my previous photoshop on it. I deactivated photoshop the old mac pro and i have the 20 digit serial except i need a 24 digit..... i cannot find how to get a 24 digit code???
Thanks

I inherited the machine at work with photoshop on it. The new laptop is also from work that i want to move photoshop onto, the person who originally installed photoshop is no longer with the company ..... any other ideas please??
Thanks

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