2 years ago I purchased a Student and Teacher Adobe Lightroom 4 that I never installed. I now want to install it on my new computer (under Windows 8), and I can't find a correct licence number !

Hello,
2 years ago I purchased a Student and Teacher Adobe Lightroom 4 that I never installed. I now want to install it on my new computer (under Windows 8), and then I will buy an updgrade to version 5. But I can't find a correct licence number ! I only find a 22 digit code, not the 24 digit expected.

Could you help me please ?

Thanks in advance.