by melville84 » Mon Oct 10, 2011 12:59 pm
Most likely you can't. Paint.net uses Microsoft's .net framework, hence the name. It's entirely designed for Windows computers. Best bet is to look for a Mac version of GIMP. It's an image editor more powerful than paint.net but not as good as Photoshop. It has an awkward interface but it's free and open source so it's available for most operating systems.