If you do not qualify for a student version and the 30-day trial is too short, consider these free/cheap alternatives:
While Autodesk does not offer a permanently "free" version for commercial use, there are legitimate ways to access it: Map 3D Toolset in Autodesk AutoCAD | Features Autodesk AutoCAD Map 3D 2023 Free Download
To summarize:
Before downloading, ensure your system meets the minimum requirements: If you do not qualify for a student
Best for: Learning GIS/CAD integration for free. Note: You cannot use this for commercial (for-profit) work. Autodesk AutoCAD Map 3D 2023 Free Download