Interestingly, version 6 is often used by modern users to "clean" files. Saving a model back to is a known method to strip dynamic component attributes while keeping the physical geometry intact.
, released in 2007, was a milestone version during the era of Google's ownership. It significantly expanded the software's capabilities, transforming it from a niche architectural tool into a popular 3D modeling platform integrated with Google Earth. Historical Significance
SketchUp 6 is considered obsolete (end-of-life). It cannot read newer .skp files from versions 2013 onward. It runs on Windows XP/Vista and Mac OS X Tiger/Leopard (PowerPC & early Intel). Use only for legacy file support or vintage modeling practice.