For Mac users you can find the files under Macintosh HD/Library/Application Support/SketchUp 2015/SketchUp/Plugins, copy both the “ImaginationVisualizer” folder and the “ImaginationVisualizer.rb” file and place in home/Library/Application Support/SketchUp 2016/SketchUp/Plugins.
You can find the library folder under the Go menu in Finder, hold down the Option key after you click on the Go menu and the Library folder will appear in the menu.
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