While many of Fredo6's older plugins were entirely free, he has moved some to a very affordable "Premium" model to support continued development. If the version for SketchUp 2013 requires a license, it is highly recommended to purchase it officially to ensure your system remains secure.
Popular review sites like SketchUp Plugin Reviews have historically given the plugin a 5 out of 5 stars , calling it an "essential tool" for any serious designer. Known Limitations & User Tips fredoscale plugin for sketchup 2013 crack best