This brush kit is designed for use with GIMP 2.6.x with the patch GIMP-Painter. Save your presets before installing this one, or it will write over and erase your existing presets (if you've created any)! Copy the content from the folder (after extracting it) into the GIMP user preference folder.
If the brush kit is successfully installed, you should see the same splash at opening as in the screenshots.
The "Chaos & Evolutions Brush Kit" installs presets for various tools, palettes, and brushes. It's just a ready-to-use brush kit for concept art, digital painting, and computer art.
To load a preset, select a tool and in the tool option windows, click the icon to load a preset.