It doesn't work

This is not a problem with the plugin but with your Amazon account. It’s a common issue that Amazon accounts are not enabled for Amazon’s Product Advertising API what is essential for using the webservice. It works fine for thousands of users.

Please check
https://www.wp-amazon-plugin.com/2012/682/issue-with-using-the-amazon-products-advertising-api-for-associates-request-from-blacklist_xyz-is-throttled/

or

https://www.wp-amazon-plugin.com/register-amazon-affiliate-product-advertising-api/

PS: You should consider a plugin’s documentation or contact its support before judging it.

So, Do you want to say that my account is a seller account and I need to enable/reactive the Product Advertising API for it?

PS: I didn’t judge anything, I just said “it doesn’t work for me” and mentioned about what happened, I didn’t say that “Your plugin is a (#&#*$%*)”!

Yes, your account must be activated for the Product Advertising API.

You rated my plugin with one star. For me this is judging.

I never had any seller account and my account is activated for PA-API since I started it.

Yes I rated your plugin one star, for me this is telling the truth.

This problem is number one in the plugin’s FAQ by the way:
https://www.wp-amazon-plugin.com/faq/

If you are sure that your account is alright, please check your settings as it would work with an authorized account. Make sure that you choose the right country store.