I am facing problem in opening ESurvey CAD 10.20 version. I have authentic key with me. I am unable to find any of your contact details.
You will need to contact the developers, because I tried to download the application, but it requires registration and when I want to register, the captcha system isn't displaying the necessary code to pass the verification system.
Contact page: http://www.esurveying.net/land-survey-software-manufacturer-contact-details/
The developers should provide additional help regarding the application and the way it works/activates.