If you are a student or educator, you can download the latest version of AutoCAD for free through the Autodesk Education Community.
It supports a wide range of DWG file formats and older LISP routines.
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Even a decade after its release, AutoCAD 2014 is highly sought after because:
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Autodesk now offers a web-based version that runs in any browser—no installation required. This is the official "portable" solution. Even a decade after its release, AutoCAD 2014
Downloading AutoCAD 2014 Portable 64-Bit: What You Need to Know