Good day. Thank you for your question.
Please refer to this page on the steps to install.NET Runtime - https://wiki.teltonika-gps.com/view/.NET_Runtime_for_Desktop_installation
If you are still unable to open the Configurator, please reach out to us via VIP Helpdesk or contact your Sales Manager/Distributor. If you don't have any contacts with our Sales managers, please contact them on our official website https://teltonika-gps.com/
and click on the "Contact Us" button. When you will click, please fill out the form and submit it.
Note: as a topic, please choose "Vehicle Telematics" or you can send an e-mail with the description of your situation to firstname.lastname@example.org
Thank you in advance.