Have you got an associates key? If not that's your problem. You need both an associates and an AWS key in order to use this plugin. It works fine for me on vB 3.7. The only bug I've found is that you have to set a category to search on any other country than the US (needs fixing to allow all), and also that you can only purchase from the store that you set the location to (in my case UK) which means that the other country searches should be hidden and only have UK enabled.
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