The term "Classic" refers to the old model, where a one-time purchase allowed permanent use of a specific version. There is no official "free" version of the Pro software; searching for "free" classic licenses typically leads to unofficial sites or crack software, which is not legal or secure. Key Facts About SketchUp Pro 2019 Licensing SketchUp Classic License
SketchUp Make 2017 is the last for personal/hobbyist use. It lacks Pro features (export to CAD, Layout, Solid Tools) but is legal, safe, and still downloadable from some sources. This is the closest you can get to a "free classic license" without piracy. sketchup pro 2019 classic license free
