A handful of third-party websites and software claim to be "FlipHTML5 Downloaders." These tools generally work by inputting the flipbook’s URL, after which they scrape the page images or even reconstruct the PDF.
Many users confuse the FlipHTML5 Desktop App with a downloader. The desktop app allows creators to convert PDFs into flipbooks locally. It is designed to download other people’s online flipbooks.
This method captures what is visible on the screen. Due to the "flip" effect, you may only see one page at a time. You would have to manually "print" each spread or use a script to automate the printing. Also, interactive elements (videos, links) will not work in the resulting PDF.