If you find the .img empty when you mount it, try renaming it to a .vob file instead and play it in VLC. I got "Disc is damaged" error in Windows 8 and "Disc is empty" message in Daemon Tools.
But renaming it to a .vob file worked. No idea why uploader changed it to a .img file, when he still writes that it's damaged.
If the .vob file wasn't damaged why not just keep it as a .vob?