How to get iOS 7 for iPhone 4S?

How can I download the iOS 7 software to my conputer and download it to my iPhone 4s

You'd have to wait for apple to release that software before downloading it

Make sure your have your device's UDID registered with a site like http://www.instantudid.com/ or you won't be able to activate. After that, this is a good site for downloading: http://imzdl.com/ios.php