: Upgrade your FortiGate firmware to 6.4.13 or 7.0.12, then use FortiClient 7.0.8 or newer for macOS.

FortiClient 6.4.3 is officially supported on macOS 11 Big Sur and macOS 10.15 Catalina .

Downloading this specific version requires using official, sometimes archived, sources, as the main website often directs users to the latest version. Official Downloads: The most reliable source for older versions is the Fortinet Support site

⚠️ Version 6.4.3 is older and may have known security vulnerabilities. Fortinet recommends using a later 6.4.x patch release (e.g., 6.4.9) or a supported 7.x version where possible. If you need 6.4.3 for legacy compatibility, follow the steps below.

: Real-time content filtering to protect users from malicious websites. System Requirements for macOS