PDF2XL 8.0 introduced a new method of activating your application using an email address and password combination, which is a little different from the older versions of PDF2XL.
Once you've finished installing PDF2XL, all you need to do is enter your credentials and click "Sign In". You should have received these credentials in an email when you registered.
If you are unable to locate that email in your inbox or spam folder, you can simply use the "Forgot Password" link to create a new password. Your email address will already be in our system.
*Note that if you downloaded PDF2XL but have not registered an account yet, you can click on the link: "Click here to sign up for free!"
If you are still using PDF2XL 6.5 or earlier, please find instructions here.