If the book is protected and downloaders are failing, the "Print" function is your best friend. This works because web browsers cannot "see" that a book is copy-protected; they only see what is on the screen.
Extensions like “Download Master” or “PDF Mergy” (for Chrome/Firefox) can detect embedded PDFs from flipbook sites, including FlipHTML5. fliphtml5 downloader link
It contained every page he had lingered on. Every highlight he'd tried to make. Every failed download attempt. And at the very bottom, a timestamp from tonight, with a note: If the book is protected and downloaders are