You'll notice at the side of the page:
QUOTE
We encourage everyone to take advantage of our map hosting and link to the download pages of their maps. You cannot link to the actual download, anti-leech is enabled.
You are fully premitted to link to the page of any file, but you will not be able to do it to the actual link of where the download starts (so anyone you link to here will have to press "I agree").
We do this for many reasons. It is our bandwidth being used, so we want people to see where they're downloading from. Plus there is a discription, ranking, author info, submittion info, etc on that page.