After you extract the HTML Article Packager .zip file, drag HTML Article Packager into your Applications folder. Then drag the HTML article folder onto the HTML Article Package icon in the Applications folder. Does that work?
Someone mentioned elsewhere in the forums that you can also create a shortcut to the app (Shift + drag) on the finder window sidebar and then you can drag your HTML folder onto it and it should also work.
Unfortunately, it does not solve the problem. Article Packager just does not fire up. I can briefly see the packager icon opening on my dock for approx. half second and then it just disappears. I tried to shut down as many background processes as possible, but no luck.