The most reliable method is through the Fortinet Customer Service & Support site. You will need to create a free account, navigate to Support > Firmware Download , select FortiClient , and browse to the v6.00 folder.
There are two main ways to get the software. It is highly recommended to avoid third-party "software archive" sites, as these can bundle malware with the installer.
| Step | Action | | :--- | :--- | | | Obtain only from Fortinet Support Portal (requires valid support contract). | | 2 | Verify SHA-256 hash against Fortinet’s published checksum. | | 3 | Isolate endpoints using a legacy VPN client in a separate VLAN. | | 4 | Apply host-based firewall & EDR to compensate for missing patches. | | 5 | Plan a migration to FortiClient 7 within 6 months. |
| Feature | FortiClient 6.x | FortiClient 7.x | | :--- | :--- | :--- | | ZTNA (Zero Trust) | No | Native support | | Modern MFA (OAuth/OIDC) | Limited/Requires FortiToken | Full support (Okta, Azure AD) | | FIPS 140-2 Compliance | Partial | Full certification | | macOS ARM64 native | No | Yes (Apple Silicon) | | Security patches | None (EOL) | Active |
The search for reflects a common IT challenge: balancing legacy compatibility with security hygiene. While version 6 remains functional in isolated, short-term scenarios, its EOL status introduces unacceptable risk for most enterprises. Organizations must treat any deployment of FortiClient 6 as a temporary exception, not a standard. The recommended path is to upgrade both the VPN client and underlying FortiGate infrastructure to version 7, leveraging modern Zero Trust features and active security support.
