To download the Nu Html Checker «vnu.jar» file, you can use the vnu-jar package from the NPM Registry. Here's a brief snippet in Java to get started:

import com.github.vnu.java.vnu.Vnu;

public class Main {
    public static void main(String[] args) {
        Vnu vnu = new Vnu();
        vnu.downloadVnuJar();
    }
}

This code downloads the vnu.jar file and makes it available for use in your Java application.

However, I couldn't find any information on a "Client v2 API jar download Product Product PNG Vector" related to the provided search results. It's possible that this is a custom or proprietary request that requires additional context or information.

If you could provide more details about what you're trying to achieve with this request, I'd be happy to help further.