Why can't I buy it
Maybe because the content doesn't exist? Maybe the author didn't upload it? (I could also be wrong and not take my words at face value.)
How to correct 404 error?
Error 404 means that the page does not "exist", you can't fix it, if you are interested in the "game" you can try typing the name on Google and see if you find it
Try to contact the game developer.
