It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I got news that Both Batman games updated... But the change log says nothing... Anyone know what about the games were updated???
My guess is that support for the new Shadows Mode was added, at least judging from the file names. If you still have the installer files of the previous version, I'd keep them. Probably not necessary, but can't hurt.