If you prefer, Grid Cartographer is also available on Steam and has all available features, equivalent to the Professional Edition. Downloads and updates will be provided via the free Steam client.
Convert your Gamer Edition (v4) of Grid Cartographer into the Professional Edition and unlock all additional features. Make sure to have your FastSpring order number to hand or use the contact page if you need assistance. This version is also "DRM Free" (CD key style)