Click on the concerned link and your download will start automatically. Or, you can also right-click the link and click on ‘Save link as’. You can then save the PDF file at a chosen location. If you see an HTML file being saved, then you are probably clicking on a link that opens a webpage. Left-click the link first to open the webpage, and then find the relevant link that asks you to ‘Download’ the PDF. You can then repeat the method just stated to download the file.