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Check that a certificate pop-up warning is not behind the FortiClient console window.

Try running as administrator with the /passive switch and log the output. For example: FortiClientSetup_6.4.4_x64.exe /passive /log c:\temp\FCTexe.log

What version of Windows are you installing on? If it is a Windows 7 device, then there is a patch necessary to allow Windows 7 to support SHA-2 code signing. If this is the case, more information can be found here on how to patch your device: https:/...

Try disabling IPv6 on their network interfaces if not in use. There is an issue being tracked where FortiClient seems to stop resolving when ISPs have DNS over IPv6 enabled and doesn't move past it to your IPv4 DNS servers. Just a guess, might be unr...

You may want to investigate FortiClient Cloud - a SaaS based EMS from Fortinet. This video link below gives a good overview, with the following updates:The Premium Cloud License is no longer a requirement.The maximum supported devices is now 5,000.Fo...