That stinketh...
You can either find a friend with a high-speed connection where you can download it and burn it, or consider buying the codec directly from Indeo. While it's a little money, it'd be a lot less hassle than trying again to see if you got it correctly.
Alternatively, I can send you the zip or executable that I downloaded. Perhaps it will work better through email... although you'd still have the download time issue. Drop me a PM with a good email address if you'd like to do that.
Sometimes, this gaming stuff is tricky...