In my case, the script downloads 393 books, taking up 4.2 GB in space. I wonder why this is much less than what’s been reported by others (7.5 GB). Do these numbers include the epub files as well? In my case, only pdf files are downloaded.
As for the number of downloaded books (there are 407 in the Excel file, but only 393 have been downloaded in my case), I’ve noticed that books with the same title are downloaded only once. Most of the time, this happens because of different editions of the same book. However, there are some instances of different books (from different authors) with the same title. For example, both books below are titled “Fundamentals of Biomechanics”, but only one of them is downloaded:
This happens with some other titles: “Introduction to Partial Differential Equations”, “Probability Theory”, “Quantum Mechanics” and “Robotics”.