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Instructions provided describe how to install ArcGIS for AutoCAD Build 250 or 300 with AutoCAD Civil 3D 2010 running on 64-bit Windows.
AutoCAD Civil 3D 2010 is only available as a 32-bit installation. It can run on a 64-bit PC in compatibility mode. The current ArcGIS for AutoCAD setup does not allow users to install a 32-bit version of the software on a 64-bit PC.
To fix this issue, follow the steps below:
If there are any other Autodesk products on the 64-bit PC that need to run ArcGIS for AutoCAD, then do not replace the folder contents of ArcGIS for AutoCAD 64-bit.