Removing DRM does not make it free. It simply means that customers will have fewer concerns about the product ceasing to function in the future. I also doubt

Removing DRM does not make it free. It simply means that customers will have fewer concerns about the product ceasing to function in the future. I also doubt that piracy of older versions would affect sales. The pricing means it is pretty much only accessible to enthusiasts and professionals, who would be inclined to use more recent versions anyhow.