You will not find older versions on the main Fortinet "Downloads" page unless you have a support contract. However, Fortinet maintains an archive.
The Complete Guide to Downloading FortiClient VPN 6.4.6: Why This Version Still Matters forticlient vpn 6.4.6 download
You are setting up a brand new home lab, you need SSO via Azure AD, or your company uses FortiToken Mobile version 2.0+. You will not find older versions on the
In the world of enterprise VPN clients, newer doesn’t always mean better. While Fortinet continuously pushes out updates to FortiClient (now moving toward versions 7.0, 7.2, and beyond), many organizations remain pinned to the 6.4.x branch for stability, compatibility, or legacy hardware support. In the world of enterprise VPN clients, newer
Not yet, but it is on life support. As of late 2023/2024, many cloud-hosted FortiGates (FortiGate-VM on AWS/Azure) have forced upgrades past 6.4.6.