2. Next, open the control panel, add or delete programs, and uninstall all the software with the words "Line" and Jiangsu CA, as shown below.
3. Then, after uninstalling, you need to restart the computer.
4. Then, after restarting the computer, close all antivirus software on the computer, as shown in the figure below.
5. Then download the latest version of line assistant, and install line assistant at this time, as shown in the figure below.
6. Then, after the installation is completed, open the main page of the software and click the online extension.
7. Finally, enter the password. After the extension is successful, you need to unplug the certificate and plug it into the computer again before you can continue to apply for use.