SketchUp User Guide / Reference Manual is needed! HTML Tutorials and a 125 page PDF Users Guide. Why not SketchUp? The most disappointing thing about the manual is that prior to version 8 SketchUp had quite an adequate help system with a table of contents and index, and beside working from inside the application it could also.
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The fact that SketchUp 8 has been superceded and not been supported anymore for years is indeed a problem for downloading the official installer. Take in mind that SketchUp 8 also hasn’t received updates to close security vulneribilities in included libraries. Usually, older versions are officially available here: (only down to 2015). Since it has been dropped from that list, you need to find it on the internet and verify it is not manipulated or infected. Seem to have only the non-Pro version of.