To download, click on an image and then right-click on the image and select "Save Image As..." to download to your computer.

To download, hover over an image and right-click on the download icon and select "Save Link As..." or "Download Linked File As..."

Alternatively, you can click on an image which will open the PDF file in a new tab. You can then click File > Save As from your browser to save the PDF to your computer.