The fact that it's only been downloaded 33 times since Mar 2006 on ZDNet should tell you what you need to know!
It's just another piece of S/W to build HTML pages offline that are then uploaded to a server. These types of stores tend to be very limited in features and can take up a huge amount of space on the server if you have a large inventory. Not requiring a database should tell you how limiting the S/W is likely to be. To move from the likes of OSC or Zen to this type of eCommerce solution would be a step backwards. For a novice it might be a good first step if you're prepared to pay what they are charging for the full product.
He's one review I found for it.
http://shopping-cart-review.toptenre...ro-review.html