If you need a permanent free solution for SketchUp 2015, consider these community-vetted tools: SimLab OBJ importer for Sketchup
The SimLab OBJ Importer for SketchUp 2015 is a plugin designed to enable the import of OBJ (Object File Format) files into SketchUp 2015. OBJ is a widely used format for 3D models, and this plugin aims to bridge the gap between SketchUp and other 3D modeling software that supports OBJ. However, the "crack" version implies an unauthorized or pirated copy of the software, which comes with significant risks and downsides. simlab obj importer for sketchup 2015 crack