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Generating or using software "cracks" and unauthorized activation codes violates copyright policies and terms of service. Instead of using unofficial activation methods, there are legitimate ways to access and activate and newer versions for free or through official channels. Official Ways to Get AutoCAD for Free
For newer versions like AutoCAD 2018, Autodesk has largely moved away from serial numbers in favor of . Download AutoCAD | AutoCAD Free Trial - Autodesk