Click on the desired screen size for the wallpaper that you had choosen. A pop-up window with the actual size wallpaper will appear. To set the wallpaper as you desktop background, right click on the wallpaper and select "Set as Background". To download the wallpaper, right click on the wallpaper and select "Save Picture As...".

800 x 600 1024 x 768	800 x 600 1024 x 768
800 x 600 1024 x 768	800 x 600 1024 x 768
800 x 600 1024 x 768	800 x 600 1024 x 768
800 x 600 1024 x 768	800 x 600 1024 x 768
800 x 600 1024 x 768	800 x 600 1024 x 768