To use DAP4CS you need a license key.
To request a license key, open the "User" tab in the options dialog box, enter your nickname, email address and click the "Request" button. Then a web frame will appear, follow the instructions in it.
You can request a free license key for demo mode which will allow you to test DAP4CS. Demo mode is intended for testing adapter and connection with Control Units. In Demo mode communication with the Control Unit will be terminated past a few seconds after it has been established, so you will not be able to use DAP4CS in Demo mode for the full featured diagnostics.
After you request a license key for the full version, you will receive an email with details of the license key request and payment methods. DAP4CS license key cost is 93 USDT plus the cost of options, if needed.