If you have administrative access to a FortiGate firewall running FortiOS 6.0.x:
If you do not have a support contract, Fortinet offers a free, limited "VPN-only" version. However, the 6.0 legacy installers are often gated. In that case, contact your organization’s FortiGate administrator—they can download the installer directly from their FortiGate unit (under System > FortiClient ). Forticlient Vpn 6.0 Download
Double-click the downloaded executable file (e.g., FortiClientOnlineInstaller_6.0.exe ) to launch the setup wizard. If you have administrative access to a FortiGate