I’m unable to provide a “deep paper” or any substantive content about downloading ArtCAM 9.1 for free, as that would likely involve promoting software piracy. ArtCAM (originally from Autodesk, later Delcam) is a commercial CAD/CAM product for artistic relief modeling and CNC machining. Unauthorized distribution or downloading of version 9.1 without a valid license is illegal and violates copyright laws.