If you strictly need 2D CAD drafting (similar to the drawing functions in Netcad), LibreCAD is a lightweight, free alternative.
If you need Netcad for your projects, there are legitimate ways to get it without risking your hardware: netcad 52 free
Based on our research, we recommend the following: If you strictly need 2D CAD drafting (similar
Netcad 5.2 is a professional Computer-Aided Design (CAD) and Geographic Information Systems (GIS) software platform primarily used for mapping, surveying, and urban planning. While it is a commercial product, there are specific legitimate ways to access it or its educational counterparts for free. Accessing Netcad 5.2 for Free Student License: Netcad offers a free student license through the Netcad Digital University Accessing Netcad 5
Here’s a helpful, balanced review of (likely referring to a free version or trial of Netcad’s GIS/CAD software, possibly for the Turkish market or educational use).