When I want to enlarge a pic, I get..."an unknown error occured" !! I've refreshed the page and used a compatability view, but still can't enlarge or download a picture !

Hi, instead of clicking "enlarge wallpaper" just click on the download button to the right of enlarge wallpaper button, you should be able to download any size that you want. I hope that I have not misunderstood and that this helps! Have a great day!