Technical Tip: How to fix the 'A JavaScript Error Occurred in the Main Process' after installing the FortiClient software in Windows

[JaskiratM]

Description

This article describes how to fix the A JavaScript Error Occurred in the Main Process' after installing the FortiClient software in Windows.

Scope

FortiClient Software installed in a Windows Machine

Solution

1) Uninstall the Forticlent Software using the FortiClient remover tool:

https://community.fortinet.com/t5/FortiClient/Technical-Tip-Uninstall-of-FortiClient-software/ta-p/1...

Follow the above article to Remove the FortiClient Software from the Windows End-point. Reboot the Windows Machine after the Uninstallation process is completed.

2) Install the latest version of the Microsoft Visual C++ Redistributable:

https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170

It is possible to download the files from the above link.

3) Uninstall any old C++ Redistributable found in Control Panel (eg: 2008, 2013):

https://support.microsoft.com/en-us/windows/uninstall-or-remove-apps-and-programs-in-windows-4b55f97....

Follow the article above to remove those old C++ services. Once removed, restart the windows machine.

4) Reinstall the Intended FortiClient Version and run the application as an administrator.

Related document:

https://community.fortinet.com/t5/FortiClient/Technical-Tip-Uninstall-of-FortiClient-software/ta-p/1...