I had a harddisk crash on my mac and unable to upgrade my Mac Mavericks, is there any old installer that still support older version for Forticlient VNC, and where can I find the source? Thank in advance.
Im not sure what FortiClient VNC is, are you sure it’s not FortiClient VPN?
If so you should be able to download from the support site, log in, go to firmware download, and FortiClient.
My bad, it’s VPN 
unable to locate on official website, that’s why I asked
Grab the VPN only version so you don’t need EMS.
Thanks, but I am looking for older versions
Log into your support account. You can get as old as v4.
Support.fortinet.com → firmware images → select FortiClient from the drop down.