Step 2: Run the Installer in Compatibility ModeRight-click the CivilCAD 2008 setup file and select Properties. Under the Compatibility tab, check "Run this program in compatibility mode for" and select Windows XP (Service Pack 3). Check the box for "Run this program as an administrator."
Bridging the Gap: Running CivilCAD 2008 on AutoCAD 2010 64-bit (Yes, It’s Possible) civilcad 2008 para autocad 2010 64 bits
does have a native 64-bit version. If you are referring to the ARQCOM "CivilCAD" add-on, specific versions exist for AutoCAD 2010-2011 64-bit. Step 2: Run the Installer in Compatibility ModeRight-click