Hello there,

When PDFs and links inside a book (likely a digital book/PDF) don't download, it's often due to browser settings or restrictions; try right-clicking the link and choosing "Save Link As," or use the Print to PDF option (Ctrl+P) if it opens in the browser, or even use developer tools (Inspect Element) to find the direct URL, and ensure you have a dedicated PDF reader like Adobe Acrobat installed for smooth handling.