How do I Update my game automatic?

How do I Update my game automatic? I have messed around with AJAX dont understand maybe someone could point me in the right direction?

Thanks

What do you mean by "automatic"?

SaY I logged on to one of my favourite games GTA it said there's a update avalible blla bla would you lile to download it?

Where do you have your game published?

I would do both like the scirra arcade and a download.

So say i booted up the game and it said new version avalible then it downloads the new version automaticly.

Assuming you are running it on some kind of web server, when you upload the new files to the web server, all users accessing your website will automatically download the new files.

This is a highly platform specific question. What platform are you using? Gumshoe has the web solution, but if it's PC, I would recommend looking into Steam's automatic updating. I imagine Google play and the Apple Store have their own update methods.