Beyond legality, consider the practical risks:
Yes, Blender is for animation, but with add-ons like BlenderCAM and JewelCraft, it has become a powerhouse for jewelry designers.
If you are a professional jeweler, using unlicensed software puts your business at risk of audits, fines, or lawsuits. Competitors or software watchdogs do target small manufacturers.
Technically: No. It is illegal software piracy. Practically: No. It will likely infect your computer with malware. Professionally: No. You cannot legally sell items made with pirated software (you risk audit fines).
The only legitimate "free" version of ArtCAM that exists is the ArtCAM Viewer (if you can find it), which allows you to look at toolpaths but not generate new ones or output G-code.
To run a pirated version of Jewelsmith 9.1, you typically need to download a "crack" or a "keygen" (key generator). These are small executable files that modify the software to bypass the licensing verification.
Cybercriminals know that jewelers and designers are often eager to get this expensive tool for free. They hide viruses, ransomware, and cryptominers inside these cracks.
Many veteran jewelers still prefer the 9.1 interface because it was purely focused on jewelry. Later versions (2012-2017) added generic manufacturing tools that complicated the workflow.