Try clicking the download button, and saving that image and using it as a background. If not you can always resize the image to your screens resolution using some sort of program ex. Paint, Photoshop, etc. Though I can't guarantee it'll look as good.
I think you might be able to set up the desktop images so they fill the screen in properties, which will probably cut off parts of the picture, or squish/stretch it. I don't really change the backgrounds on my Windows all too much, so I am not 100% sure.