Where can I get a digital download of Skyrim

I bought a CD version some years back, lost the disk, but still have the case so I assume the CD Key is still in it. I just have to pick it up from my brother tomorrow. I don't want to buy a whole new game. Is there anywhere I can just download the raw game and use the key I already have?

Try to add the game on steam

Skyrim requires that you activate it on Steam, so you should be able to download it off the Steam account you originally activated it to.

or if your stuck there might be a type of bay you could get it from