Where is the Flex/AIR SDK?

Adobe used to release a combined SDK for Flex and Air that could be used with Flash Builder. There is still a link with this description on the Air SDK download page.

http://www.adobe.com/devnet/air/air-sdk-download.html

However, the combined SDK does not appear on the gaming page. There is only something new called the Gaming SDK.

http://gaming.adobe.com/getstarted/

Is the Flex/AIR SDK available somewhere for AIR 3.5? Or do I need to get the Gaming SDK?