Can't download upgraded iOS

I've gone to iTunes to download the new iOS 4.3, but can't seem to get it. When I search for iOS 4.3 I get a game app. I guess I'm just feeling extra stupid today. What do I need to do to get the new OS so I can sync it to my phone?

I always start iTunes and connect the iOS device (iPhone in my case). If there's an update available iTunes tells me; if I want to check I click the Update button (under Summary).

Have you updated your iTunes. You must up date to 10.2.1 before iOS 4.3 will be available to you. Also, iOS 4.3 will only install on an iPhone 3GS or 4. I don't believe it will install on a Verizon iPhone.