We actually can't share links to them here because Microsoft does sometimes crawl this place and the site is trying to avoid C&D letters and copyright problems.
However, you could look online at other sites or maybe see if there is an official digital river link.
I know there have been cases of people contacting Microsoft and them providing an official link, provided you have a product key.
If you have a product key slip, an old saved key or a key on the side of your computer/laptop you could ask Microsoft support and provide the key. They SOMETIMES will give you a download link. I've heard of it done a few times.