It is my honor that I just know the answer. But it is my own experience, hoping it will be helpful to you. PDF to PowerPoint Converter was researched by VeryPDF. It is widely used in companies now. If you want to use it, you have to download it from this link http://www.verypdf.com/pdf2ppt/index.html#dl and you need to pay for your downloading.
By clicking this link, you will enter the downloading page, like figure 1. But if you want to download it by clicking buttons in the figure 1, it is useless. You have to go forward to nearly the bottom of the page then you will see figure 2 then click it, you can get it.
If you download it successfully, you can see the interface of this software, like figure 3.
I had the same problem when I wanted to download it first time. I clicked “Free Download” and “Buy Online” many times but I failed. Then I went to the figure 2 and had a try then I made it. In order to let more friends know how to download it and save more precious time.if you like, you can tell them or share it in other websites.