If you have purchased the software via PayPal, please go to check your license information in the email account of your PayPal.
Or please send me your PayPal email address to firstname.lastname@example.org, we will resend the license information to you.
Thanks in advance.
It seems you have a lot of problems with people finding their License codes after purchase. It would seem beneficial for you to make that process easier for your customers rather than keeping it the way it is.