Here is the proper, professional workflow to get accurate Google Earth terrain contours into AutoCAD. This method uses Google Earth Pro’s "Save Place As" feature and a free online converter to generate true polylines.
This is a common workflow for landscape architects, civil engineers, and surveyors. The core challenge is that (like Shapefiles or DWG). Instead, you must either generate contours from elevation data or trace them. how to get contours from google earth into autocad