Because the installer is unsigned and old. Some cracks or keygens circulating alongside it are flagged as potentially unwanted programs (PUPs). If you have a clean installer from an original CD, you can add it to your antivirus exclusions.
If you decide to pursue Cutmate 2.1, follow these safety rules: Cutmate 2.1 Free Download
Adds dedicated buttons directly into the CorelDRAW window for "one-click" cutting. Because the installer is unsigned and old