Third-party downloaders often operate in a grey area; they are highly effective for public domain works where copyright has expired, but using them to circumvent protections on copyrighted material may violate terms of service.
A typical 300-page book takes 2–5 minutes depending on your internet speed. Download Google Books Downloader 2.7 for Windows
While Google offers a "Download PDF" button for public domain books, this feature is rarely available for copyrighted material. Users are often forced to read within a browser window, reliant on a stable internet connection. Third-party downloaders often operate in a grey area;