Sometimes, you cannot find an SKP v8 file, but you can find a generic 3D file.
While Google SketchUp 8 is obsolete, its precision and speed are unmatched for users on vintage machines or those who simply prefer the classic toolset. Finding requires a little more effort than it did a decade ago, but with the resources above—the Internet Archive, conversion tricks via SketchUp Make 2017, and dedicated legacy forums—you can fill your model with millions of free objects. Google Sketchup 8 Components Free Download
Complex modern components with PBR textures and extensions may lose rendering data, but the basic geometry will survive. Sometimes, you cannot find an SKP v8 file,