: The most straightforward way to use AutoCAD 2015 or its newer versions is to buy a license directly from Autodesk or an authorized reseller. This ensures you receive a legitimate product key and access to official support.

Autodesk Education Plan: Students and educators can get free access to the latest versions of AutoCAD for one year (renewable).AutoCAD Web/Mobile: Lower-cost subscriptions for users who only need core drafting tools.Free Alternatives: Software like FreeCAD, LibreCAD, or trial versions of BricsCAD offer similar functionality without the licensing headaches.