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Inventor does not support importing of Google Sketchup .skp format. There is an addin for sketchup that allows you to export to stl file but then you would need another convertor to go from stl to something Inventor can open.
The free models are for use in Sketch Up. Why spend countless extra time offering a compatible cad format when very little will actually use it. Demand and money makes the world go around.
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