If you have a valid license but lost your installation media, the following steps are recommended by the community:

If you do manage to find a legitimate installer (such as from an old physical disc), ensure your system meets these specs:

If you are interested in an article about AutoCAD 2012 for historical or educational purposes (without crack instructions), I can help with that. Let me know.

Rather than risking system integrity with unverified "cracks" from third-party sites, consider these free or trial alternatives that offer modern 64-bit compatibility: Download AutoCAD | AutoCAD Free Trial - Autodesk

Using unlicensed software can have severe impacts, especially for businesses: Software Audits