I found four games with missing links:
star ocean
super castlevania iv
super ghouls n' ghosts
terranigma
Mozilla Firefox gave an error saying 550 Failed to change directory. Then I tried IE and got a blank screen when attempting the link for each of those games. I also made sure I was downloading only one rom at a time. Other roms were downloaded successfully.
I searched for Super Metroid also, it being one of my all-time favorite games. A classic like that could definitely be added on your list of roms.