If you just need to connect to an existing Cisco corporate VPN, I’ve had great success with Shimo. I suspect this was a TidBITS recommendation. I haven’t used it for a couple of years, but when I did, it was stable and much more elegant than the Cisco software. You can set it up for one-click passwordless access – probably breaks company policy but a lot easier for repeated logins 
As @ssteiff said, getting hold of new versions of Cisco AnyConnect is a pain and the UI is horrible.