Purchase the programe and download it.
The file will be saved in downloads folder by defult by the name of Wi-Fi password Capture.bat ,then just open it.
Open the software. And you will see few User profiles these are the Wi-Fi ssid that are ablavable to extract password from. Then just copy the ssid and paste it infront of WIFI Name : and press enter.
After that all the details about that Wi-Fi will be shown to you. And the password of the Wi-Fi will be given by KEY CONTENT which will be under the subheading SECURITY SETTINGS.