An automatic email will be sent out after successful payment. In the email, it has two-piece information: one is your registered email address, the other is a verification code.
Choose the menu "License | Retrieve license key online" from software, an online license window will appear. Enter the email and verification code in the license window, click the "Retrieve License Key Online" or "Next" button to complete online license key retrieval.
In the end, you will get a confirmation message indicating "License key is installed successfully".