Here is a guide on how to find, download, and load the Classic interface. You are looking for a .cuix file (Customization User Interface). The standard name usually used by the community is Classic.cuix or AutoCAD_Classic.cuix . Sultan.2016.1080p.hdrip.cinemaluxe.cfd.mkv
Since Autodesk removed the "AutoCAD Classic" workspace in newer versions, you must manually load a .cuix file to restore the old look. Vijayakanth Movie List Top Site
The best way to get this file is to copy it from an old computer running AutoCAD 2014 or older. The file is located at: C:\Users\<Username>\AppData\Roaming\Autodesk\AutoCAD 2014\R19.1\enu\Support\acad.cuix (Rename this to classic.cuix or use it as is).