Hard Drive crashed - lost CS5

My computer crash and I lost CS5. I downloaded it in 2012 from the Adobe website. I was attending an online school and believe that is where I had my serial # saved. Well, I no longer have access to that email account. Is there a verification process I can go through to get the serial #? I really don't want to pay for the program again if I don't have to. Please advise. Thanks!