Hi Azor, you can download the alpha demo here:
- WINDOWS (64-bit): http://bit.ly/1OUcEMa
- WINDOWS (32-bit): http://bit.ly/2087IXZ
- MAC: http://bit.ly/1H6lD56
- LINUX: http://bit.ly/1H6lIpe
But we're working on a beta version of the demo (it's going to be much better than alpha), so we suggest you wait for that instead :)