: According to the End User License Agreement (EULA), SketchUp licenses are generally non-transferable, meaning you cannot legally buy a used license from another individual. Limitations of Using 2016 Today
If you already own a 2016 license or manage to find a legacy installer, be aware of significant functional limitations: buy sketchup pro 2016
: Be cautious of websites offering "one-time purchase" licenses for older SketchUp versions; these are often fraudulent or pirated software that may contain malware. : According to the End User License Agreement