Firstly, the only current supported Sketchup format is 2014 so don’t press the first download button you see, click on the item itself so it is the only one on the page THEN go to the top right and click Download – you ought to be presented with different fomats and make sure you choose the 2014 format.
Secondly, I prefer just using my normal web browser to go to the Sketchup Warehouse and downloading all the useful shapes in one go and putting them in a Sketchup folder under 202 Files. I then use the Import from Local File option to brign them in.
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