Correct, Butel software works in Windows only. You have a couple choices:
Buy or download a program that allows you to run Windows on your Mac such as BootCamp, Fusion or Parrallels. You will also need to get a copy of Windows then install it after you install one if the above.
Get a cheapo Windows computer. Just about any old box with Windows XP or Windows 7 will work just fine if all you want to do is program your scanner. A $250 Netbook will work just fine, as will the old computer your neighbor sold at his tag sale for $50.