Autodesk provides free access to its software for students and educators, which can be a viable option for those in academic circles.
Many users still seek AutoCAD 2012 because: Autocad 2012 Portable Free Download 103 - Google
The string "103" in your query likely refers to a language pack (e.g., Italian – codice lingua 103) or a file archive part number. Regardless, no legitimate "portable" AutoCAD exists. Autodesk provides free access to its software for
AutoCAD 2012, developed by Autodesk, is a classic and powerful version of the industry-standard computer-aided design (CAD) software. At its time of release, it represented a significant leap forward in CAD technology. The key new features included: developed by Autodesk