After downloading, check the file signature (right-click > Properties > Digital Signatures) and ensure it is from

While it is always recommended to run the latest supported software, specific legacy builds like 6.4.6 are often sought after for specific reasons:

In the landscape of enterprise remote access, Fortinet has long been a staple for secure and reliable connectivity. represents a specific build within the 6.4.x lifecycle that is widely regarded as a stable, "workhorse" endpoint for organizations utilizing Fortinet security infrastructure.

. However, this site typically only hosts the most recent "Free" version. For 6.4.6, you will likely need access to the Support Portal mentioned above. Key Features of Version 6.4.6 SSL and IPsec VPN