Email add. not in use anymore. How to change.??

Hi.
I have ver. 11 on my Imac. I want to move it to my Mac air running Sierra ( not high ) Then I want to buy ver 13. new licens for Imac ( sierra high ).
Quest. I do not have the Email anymore that was used for registration on ver 11.? I cannot login on it , ( Forgot password for the account) this here is new made.
Haw can I move the ver 11.? I have serial and Of cause key nr. for the ver 11. + bill. ??
I know I shall logout from Old Installation before installing on new, but what happens when I can't remember password for account ??

Kind Regards Lars

 

Hello LarsK3, please check your private message and provide us with the necessary details. Thanks!

 

I have this same problem. the email address is no longer available. heck the firm that supplied the email is no longer available. how do I change my email address on my account?