Users with an active support contract can sometimes access legacy firmware via the Fortinet Support Site .

Are you trying to install this on an , or Upgrading FortiClient - Fortinet Document Library

Version 6.0 marked a significant era for Fortinet. It introduced a more modern user interface, improved stability compared to the 5.x branch, and better integration with the Fortinet Security Fabric. The "VPN Only" version of 6.0 was particularly popular because it offered a lightweight installation for users who only required tunneling access without the need for heavy antivirus or web filtering modules.

FortiClient VPN is a software application developed by Fortinet, a leading cybersecurity company. It provides a secure and encrypted connection to remote networks, allowing users to access network resources and data from anywhere, at any time. FortiClient VPN supports various platforms, including Windows, macOS, iOS, and Android.