Quickly add new SDK versions to Flash Professional CS6:
- Download SDK. Just Google Adobe AIR SDK or visit this link for AIR SDK
- Help menu > Manage AIR SDK...
- Click "+" and add new AIR directory (in this case I'm adding AIR 3.6 folder that I coppied to Applications/Adobe Flash CS 6 but it can be any folder)
- Click OK
- Select new SDK from Target dropdown in Document Properties tab.