I maintain a list of pos vendors and have been unable to reach them since last summer. The phone and webpage are both disconnected. If someone is still supporting this product, hopefully someone will see this inquiry and provide us with the info.
If not, I suggest checking out the list for a suitable replacement. Most vendors will offer a special "competitive upgrade price", if you ask. This forum is generously sponsored by a leading POS vendor, worthy of checking out.
If you find any more info about VisionWorks, please let us know so I can update the list.