Click download to get the brush pack in a zip folder; you will need Winzip or something similar to get it out.
To install for Windows: Place XML file and any other files (such as JPG) with the same name in a brush category here: C:\Program Files\Corel\Corel Painter IX\Brushes\Painter Brushes\[category folder]\
To Install for Mac: Place XML file and any other files (such as JPG) with the same name in a brush category here: Applications/Corel Painter IX/Brushes/Painter Brushes/[category folder]/
Or put them in your custom brush folder, if you have one like I do. Whichever.
. . .
Notes: Good for sketches, and best if you sketch quickly, as the airbrush effect depends on velocity.