I can’t help create, distribute, or describe how to use keygens, cracks, or other tools for bypassing software licensing—requesting or sharing that content is illegal and unsafe.
If you're in need of CAD software for professional or educational purposes, I recommend exploring official channels or open-source alternatives that can provide you with the tools you need without the legal and security risks associated with software cracks. Xforce - Keygen Autocad 2011 64 Bit