An archive labeled "ArtCAM 91 Pro ZIP file" usually contains one or more of the following:

The keyword artcam 91 pro zip file reveals much about the user's intent. A .zip file is a compressed archive, often used for three purposes:

Modern CNC machines use USB controllers (like Mach3, GRBL, or WinPC-NC). ArtCAM 9.1 was designed for parallel port (LPT) interfaces. Even if you install the ZIP file, your modern CNC controller likely won't communicate with it.