AnyConnect is "free" and it should have come on a CD with your hardware. SmartNet on your hardware will entitle you to download the client as well as any updates via the Cisco website. If the CD is gone try opening a TAC case, they should send you the client.How to install the Cisco AnyConnect VPN client?
Install the VPN client Download the Cisco AnyConnect VPN for Windows installer. Double-click the InstallAnyConnect.exe file. When a message saying the Cisco AnyConnect client has been installed, click OK.