Select path to install demo

Windows:
![image](https://f.cloud.github.com/assets/1102381/2429615/150e87c6-ac8e-11e3-85bd-35a9de68b130.png)

Debian:
![image](https://f.cloud.github.com/assets/1102381/2429619/29f59e68-ac8e-11e3-8719-489a467b184a.png)