While the promise of a free, optimized "repack" is tempting, there are significant risks associated with downloading files from unauthorized file-sharing sites or torrent repositories.
Most offer digital ebook lending (e.g., Libby or OverDrive) for free.
Yes, I know why you're here. You want the free download. While you can find repacked PDFs floating around on torrent sites or file-sharing forums, I strongly advise against it for three reasons:
How to get a legitimate copy