6.4.9 is latest release in 6.4.X. Why are you still using 6.4.1?
Yes 6.0.X had lots of features but those are now moved to paid version provided by FortiClient EMS.
FortiClient VPN is free version for VPN-only.
FortiClient is paid version with all features, managed by EMS server.
For FTM push issues please upgrade to 6.4.9 and see if it works.