The trial request has to be sent from SDC Verifier program. Download setup and install it.
Run SDC Verifier, execute Help - License Manager from Main Menu:
Select Trial License option and press Request License:
Fill in contact information (company name, contact person, email and phone number) and press Generate.
Press Send button to run default mail client (e.g. Microsoft Outlook or Mozilla Thunderbird) to send the request.
Alternatively, you can copy the Request Data and send to firstname.lastname@example.org.