I cannot log in as my e-mail adress has changed and it wants to reset password

Hello,

I bought a medical e-book back in 1012 and need to download it again.  However, my login e-mail is not active anymore and Adobe wants to reset the password (I know the old one) and sends instructions to my defunct e-mail.  How do I get Adobe to change my login e-mail, so I can gain access to my account again or at least the instructions, so I can reset the password and e-mail adress?

Cheers,

Nete