pkg files you want for Windows, MAC and Linux are available to download here. Your users may require more time to authenticate, so the following steps will guide you in creating a profile to override the default timeout.
Enabled logging on Cisco VPN client 5.x and seeing this: 70 13:22:21.563 01/29/15 Sev=Warning/2 CVPND/0xA340000E Failed to get adapter index.
Now get password prompt and all phases complete but dies on getting interface index.
