Write original articles yourself. You shouldn't need to use any type of software for help.
If you started a website, you started it because you know a lot about 1 niche and will continue to learn it and try to stay on top of the latest changes so you can then blog about that to your followers.
If you are unable to come up with original content for your website, you shouldn't create a website because you will not succeed. Creating a website in a high paying niche expecting to make a living from your website is not going to happen over-night or even after a year.
You need to build up trust and a reputation for providing valuable content.
That software is a waste of money and I don't even believe the testimonials on that page to begin with. It's a hyped up sales pitch to get you to waste money