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Autodesk offers a free trial of PowerMill for 30 days. You can sign up on the Autodesk website to download and try the software. You're looking for a free download of Autodesk PowerMill
While is high-end industrial CAM software that requires a paid subscription for commercial use, you can legally download and use it for free through official trial and educational programs. How to Get Autodesk PowerMill for Free autodesk inc. powermill free download