Pazera Audio Extractor

Need to know if the audio extractor I downloaded is safe or if I'm getting a false negative.

When I download from the direct link, NIS says it is safe. However, when I click install, NIS says it isn't, blocks it, and removes it from my computer.

Why am I getting mixed alerts? (see atchs) OK.JPGBlocked_0.JPGIs it ok?

Thanks for any guidance.