downloading the software you need to go to Software.cisco.com and download all parts of the software. The size of the Simulator is huge and the latest release 5.5 comes in six parts each 10 GB which makes the whole downloadable file size more than 60...
Pretty much if you are working on building an Android VPN app, OpenVPN comes out as an option. Since OpenVPN has a lot of community support, you can easily build a VPN client for any platform. So I have created to an app in Java, using Android Studio...