Fortigate 6.0.3 VPN FortiClient SSL

Hi, I currently have version 5.4.5 installed and I use Ipsec VPN with Forticlient installed on the notebooks. When I installed 5.6 all ipsec VPNs stopped working and apparently I needed an SSL certificate. I went back to 5.4.5 and the VPN came back to work. Is there any doc to implement VPN in version 6.0.3? Or how to implement FortiToken for SSL VPN via Web Portal and publish the RDP access to each user's desktop? Thank you.