While some older forum posts suggest contacting Autodesk Support , the standard policy is that unsupported versions are considered obsolete and may not be available even upon request.
Dassault Systèmes offers DraftSight, which has a familiar 2012-like UI and can read/save DWG files up to the 2018 format. The free version has basic 2D drafting—perfect for former AutoCAD 2012 users. autodesk autocad 2012 download trial
If you only need to view or measure DWG files, Autodesk DWG TrueView is a free utility. Reference Information for 2012 While some older forum posts suggest contacting Autodesk
You can download a 30-day free trial of the latest AutoCAD version from the official Autodesk website. autodesk autocad 2012 download trial