The model is provided in a Cinema 4D r11.5 file format with both clean and dirtied textures in .jpg and a custom painted HDR map. This is all compressed in a .7z file.
This model is provided FREE for open use, however there are some restrictions.
1. This cannot be used in commerical work without the permission of Sony Pictures. This is because they own the copyrights to the District 9 franchise.
2. This cannot be distributed openly as YOUR work, as it clearly is not.
3. Credit must be given in any derivitive work you create with this model, this can be in any form, provided it is visible.
NB: I assume no responsibilties if this model screws up your system. While I have virus and malware checked the file, there are never any guarentees.
That said, It should be fine.