I downloaded the demo of the game and then, when I was about to install it, an error appeared that said that the AIR file was missing or damaged, can anyone explain me what does that mean ???
Try to download the file again?
I did it 5 times, didn't work
If you have any kind of download manager, turn it off.
If you still can't get it to work, try to download just the air file and install it (make sure you already have adobe air installed first).
Here is the air file for the demo:
http://knucklecracker.com/creeperworld/demo/CreeperWorldDEMO.air