The email address to be used for logging in is the email address you used for your purchase.
If you've used PayPal or JVZoo you can also log in by entering your PayPal Transaction ID or your JVZoo Payment Id.
An example of a PayPal Transaction ID is
5K346329BQ625939T.
An example of a JVZoo Payment ID is
3AY52352K8374259Z-B023.