Why won't my xbox360 download any compatibility emulators?

I have the latest dash, but when I insert an original xbox disk (confirmed on wiki to be compatible) I just get an error to install additional software without any option or instruction as to what this software is.

The games were Fable: The lost chapters and GTA: Vice city. They were undamaged. Both show up on the List of Xbox games compatible with Xbox 360 wikipedia page. I have plenty of space on my 250GB hard drive.

Solution 1:

You could try downloading the compatibility pack here. I don't remember having to do this, I think it auto updated but that was years ago and maybe since the newer releases it wasn't something that was overtly needed so they didn't provide it automatically.