Use zLibrary https://1lib.sk/ Much better for browsing and if you're not donating to annas this is where a lot of downloads come from. It will be listed in the slow downloads section, but is far superior to the other links. You only get fast downloads from annas if you donate "monthly". I recommend looking for epub versions then converting to pdf using https://cloudconvert.com/epub-to-pdf. That way you get chapter links. Some PDFs have them, but not all. epub is superior in that aspect.