You know, at the cost of $2,500 per year, (although I can't actually find where to purchase the software) you'd probably be better to just YouTube some kid's backtrack tutorial.
What software are you talking about? CloudCracker?
Using the Silica wireless hacking tool sold by penetration-testing software provider Immunity for $2,500 a year, I had no trouble capturing a handshake established between a Netgear WGR617 wireless router and my MacBook Pro.
Using the aircrack-ng suite you can do it for free.
That's exactly what this article points out in the very next sentence after the section I quoted.
Read the article, or view it and press CTRL-F and type $2,500.