Do you get any errors? Have you checked your Downloads folder? Unlike PCs, downloaded files on mobile devices (especially PDFs) do not open in-browser or automatically, they just download to your phone (unless your device is blocking download prompts/pop-ups or the browser app has the permission to access storage disabled).
Welcome to Android Central! You are talking about trying to access those files on your Android device, not on your PC, right? Which browser are you using? Or are you using the Google search app to get to that site?