If you need CAD software for free, you have excellent options. Do not risk your PC's security for a broken, 32-bit old version.
If you are a student or educator, you can get free, legitimate access to the latest versions of AutoCAD (which are fully compatible with 64-bit systems) through the Autodesk Education plan Gratis Autocad 2007 64 Bit Bagas31
Here is the cold, hard truth:
Use the free Autodesk TrueView (official viewer) plus AnyDWG Free Converter . If you need CAD software for free, you
It supports the .dwg format, which is still the universal language of CAD. Key Features of the 2007 Version you can get free