You can download all or select images as you wish. You must be at a computer to download. 

To download ALL: at the top of the page, below the header image, press the “download all” button. It will download them all as a zipped file. Then open the file and move all the images to where you would like to store them.

To download Select Images: Select the image you would like to download and click the bottom button on the right hand panel. (The button is a cloud shaped picture with a down arrow in the center.)