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download the zip file from our download page. It contains a single rbz file, which is another (renamed) zip file. Unzip the last one into "%appdata%\SketchUp\SketchUp {2016/2017}\SketchUp\Plugins" of all users on all machines or to "%programdata%\SketchUp\SketchUp {2016/2017}\SketchUp\Plugins" on all machines.
Make sure the directory structure matches the structure when using Extension Manager.