How do i find my older key license?

I need to update my version and it wants my older version of my key and I can’t find it. Also, I just purchased a new license and can’t get my email to show up. please help

Go to the following page via a browser and type in your email address you registered with, and your activation key/s will be sent to you.

https://www.emclient.com/lost-activation-key

Then “go to your webmail inbox” and copy the key/s to eM Client activation field via “Menu / Help / License / Activate”. If you don’t get the email, then look in your spam / junk folder.