Design and shape the world around you with the powerful, flexible features in AutoCAD 2012 software, one of the world’s leading 2D and 3D CAD design tools. Maximize your productivity with updated tools for conceptual design, model documentation, and reality capture.

Design and shape the world around you with AutoCAD® software, one of the world’s leading CAD programs. Explore ideas more intuitively in 3D, speed documentation, share ideas seamlessly, and customize AutoCAD for your specific needs.
With new and updated tools for 3D conceptual design, model documentation, and reality capture, AutoCAD 2012 helps design professionals maximize productivity

For 64-Bit AutoCAD 2012 Microsoft Windows 7 Enterprise, Ultimate, Professional, or Home Premium (compare Windows 7 versions); Microsoft Windows Vista Enterprise, Business, Ultimate, or Home Premium (SP2 or later) (compare Windows Vista versions); or Microsoft Windows XP Professional (SP2 or later)
AMD Athlon 64 with SSE2 technology, AMD Opteron® processor with SSE2 technology, Intel® Xeon® processor with Intel EM64T support and SSE2 technology, or Intel Pentium 4 with Intel EM64T support and SSE2 technology
2 GB RAM
2 GB free space for installation
1,024 x 768 display resolution with true color
Internet Explorer 7.0 or later

Additional Requirements for 3D Modeling (All Configurations)Intel Pentium 4 processor or AMD Athlon, 3 GHz or greater; or Intel or AMD dual-core processor, 2 GHz or greater
2 GB RAM or more
2 GB hard disk space available in addition to free space required for installation
1,280 x 1,024 true color video display adapter 128 MB or greater, Pixel Shader 3.0 or greater, Microsoft® Direct3D®-capable workstation-class graphics card

You can mount or create the bootable ISO. or extract all the files from the disk into afolder and run "setup.exe" from there.