I couldn't find any information on a "Vector Product PNG" in the provided search results. However, I found that there is an OpenAPI Generator CLI package available on NPM.

To generate API client libraries (SDK generation), server stubs, documentation, and configuration automatically given an OpenAPI Spec (v2, v3), you can use the @openapitools/openapi-generator-cli package.

Here's a brief snippet to get you started:

npm install @openapitools/openapi-generator-cli
openapi-generator generate -i path/to/openapi-spec.yaml -g java -o output-path

This command generates the Java client library for your OpenAPI Spec. You can then download the vnu.jar file, which is a Nu Html Checker file, using:

wget https://example.com/vnu.jar

Please note that you need to replace path/to/openapi-spec.yaml, output-path, and https://example.com/vnu.jar with your actual OpenAPI Spec file path, desired output directory, and the URL of the vnu.jar file.

If you have any further questions or clarification regarding this answer, please let me know.