Thanks for the reply Alex. I have always downloaded the Flex SDK and the AIR SDK separately and then combined them just by unzipping them to the same directory according to <<https://helpx.adobe.com/x-productkb/multi/how-overlay-air-sdk-flex-sdk.html>>
Today I tried using the ant script as directed by Piotr, but that failed redirecting from http:// to https://. I did see from his instructions that we need AIR 29, so I'm going to abort using previous versions. I looked in the frameworks, and VDividedBox is definitely there. So, now I'm think that Flash Builder is not accessing the frameworks file correctly. mx.swc is not overwritten by AIR Alex -- Sent from: http://apache-flex-users.2333346.n4.nabble.com/