For Mac OS X,
drag and drop the Corel Painter X application folder into the "Trash" icon.
Click "Home" to find your "User" folder menu. Access the "Library" menu to find an "Application Support" folder.
Find the "Corel" folder and drag and drop it to the "Trash" icon. Look for the "Preferences" folder in that same "Library" menu.
Drag and drop the "com.corel.PainterX.plist" file to the "Trash" icon.
Open the "Finder" menu and complete the installation by selecting "Empty Trash."