In the DAP4CS program options dialog box, enter your name (nickname) and your email address, then request license key by clicking the corresponding button in the dialog box.
You will receive a message to your email box asking you to confirm your email address.
After confirming your email address, you will receive the license key file if you made request for the Demo mode. If you made request for the full version, then you will receive an email with details of the license key request and payment methods. The cost of the DAP4CS license key is 93 USDT.