Based on the information presented on the official website, you will need to send an email to the developer to issue you an authorization code. The first time you launch the software, it will give you an ID. Copy the ID and mail it to the developer using the email address posted below:
First time you run Call Analyzer it will ask for an authorization code. Click OK and you will be given a PCID. This PCID is now available in the clipboard and can be pasted and mailed to firstname.lastname@example.org. We will provide you with your personal authorization code as soon as possible. - Netcare International
Access the page and scroll down to find this information.