→Blender versions 2.63 and later: Notices about how latest version handles missing textures.
* If you wonder where to put the scripts you could open blender's user preferences (''CTRL ALT U'', or ''File->User Preferences'') tick e.g. Import/Export and extent the informations concerning an existing script. Usually this throws the path. For Ubuntu 14.04LTS/Blender 2.79b e.g. it's: ''/usr/share/blender/scripts/addons/''.
* Be aware of the selection "Mirror color to emis/ambi" usually emissive/ambient 1.0 does produce pale results. Hotfix: Adjust mirrorcolor as ambient, choose mirror color->ambient in filter.
You can report bugs with the addon [https://github.com/majic79/Blender-AC3D/issues here], but please include problematic .ac/.blend files and their textures.