How do I repair a corrupted FortiClient installation that's causing JavaScript errors?

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Grade: Education Subject: Support
How do I repair a corrupted FortiClient installation that's causing JavaScript errors?
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Uninstall FortiClient completely using the Windows 'Programs and Features' control panel. Download the latest version of FortiClient from the Fortinet support website. Before reinstalling, run a system file checker scan (sfc /scannow) in an elevated command prompt to repair any corrupted system files. Then, reinstall FortiClient.