Office 365 Install

I am unable to find the install information to use on other computers. 

I am unable to logon to my account as I can't remember what username & password I used.

I pay for it every year. I don't have that email or the original.

I was forced to create a new account.

I tried looking on my PC for an install code/key, but can't find it.

Did a lot of Googling to get answers to no avail. 

I'm thinking that my old account is using an email I no longer have as I've moved.

Please help if you can or direct me to the place that can.

Thank you!

David