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Las únicas vías legales y seguras para usar AutoCAD en Windows 7 de 64 bits son: Descargar AutoCAD Portable para Windows 7 64 Bits:
There is no official "portable" version of AutoCAD provided by Autodesk. Most "AutoCAD Portable" downloads found online are unauthorized, tampered versions that carry significant security risks, including malware and data theft. Troubleshoot errors on your Windows 7 system