Native l2tp ipsec remote access vpn

Hi

We have some remote users with windows 7 and forticlient vpn app does not install on windows 7. I created a native l2tp vpn tunnel, it created 2 firewall policies automatically. I also want to have split tunneling enabled. When they connect via this tunnel, they can not connect to our internal network nor internet. What should i do to have access to internal networks and internet at the same time? Thanks.