@modok, Some links won't give you the file,it will probably give you "ILivid Downloader". Don't get this, get something called JDownloader 2. Here is a link...
jdrch.wordpress.com/2013/10/01/where-to-get-the-full-adware-free-jdownloader-offline-installer/
I gave you this link because the normal one comes with adware.
Now with this ,when you go onto a uploaded xbox iso page this will automatically register the links on the page in LinkGrabber (inside JDownloader). Also note you will have to complete CAPTCHAS along the way. It will then tell you whether the files are online or offline. If they are offline the link is dead and you have to look for another. If it is online you are able to download it. Most XBOX isos will have part 1, part 2 and part 3, you will have to download all of these for Jdownloader to package it for you.