: If you are mixing 32-bit and 64-bit software, it is critical to install them in chronological order—oldest to newest—to avoid "entry point" errors and system crashes. Key Modules and Features
AutoCAD 2007 is natively a and was never released in a 64-bit version by Autodesk . However, it can often be installed on 64-bit Windows operating systems using compatibility modes. CivilCAD 2007 (by ARQCOM ) is the specific add-on designed to integrate with this environment. Installation Guide for 64-bit Systems civilcad para autocad 2007 64 bits new
For users running 64-bit systems who absolutely must use this combination, you often have to trick the software. : If you are mixing 32-bit and 64-bit