The plugin ecosystem for Instant Road has evolved over the years:
If you are looking for zero-cost options, consider these built-in or community tools: Easy Roads in SketchUp with INSTANT ROAD! instant road plugin sketchup free download
Select your terrain mesh and a centerline or face outline, then click the Make Road icon to generate your geometry. Free Alternatives The plugin ecosystem for Instant Road has evolved
In SketchUp, go to Window > Extension Manager , click Install Extension , and select your downloaded file. go to Window > Extension Manager
This is the fully supported version. It requires a yearly subscription (currently approximately $38.00 USD) and an active internet connection to run.
The plugin automatically modifies your terrain mesh to match the elevation of the road.