There is a possiblity that you may not have space on the drive. Delete something you don't need if this is the case. Also if there is a usb stick in the Xbox the files may be downloaded to that. Check where the download is going to in the "Active Downloads". Also try to continue the download, it may tell you why. If this is not the case, you may be trying to use a disk with the on demand disk 2 files (They do not work, it will say disk unreadable). Finally, check your storage and make sure there is 7Gb space free for the files. If it is GTA, go to your download history under account settings and redownload them there.
