This project is still available on the Asset Store, but for how long? I'm hosting it here just in case. It's an excellent project with a lot of value.
This project has great assets and it's basically a fully working top down shooter game which you can extend on. It runs great and it looks great, even by today's standards.
This project is verified working in Unity 4.7.2 which is the latest released version of Unity 4. You can can get this version of Unity and the project from the links on this page.
Disclaimer: This project is no longer officially supported and it is NOT for Unity 5. Most likely you'll get no support from me either, just use take it for what it is.