As you can see from the screenshot, below, I was unable to install the Toolkit for CreateJS [ver 1.2, released 3/28/2013]. I recently upgraded to Flash 13, which is, apparently, the reason the Extention Manager is complaining. Is this what it looks like: the CreateJS Toolkit is out of sync with the latest release of Flash? Or am I missing something? [I'm running Flash 13 on Win 7 64bit]
Update: I contacted someone at customer support and they suggested that the problem might be that I was using Extension Manager CS6 and that I upgrade to Extension Manager CC. I tried that, rebooted (just in case) and then tried the download again -- same error message!
Message was edited by: GraphiteFingers
Toolkit for CreateJS has been integrated into Flash CC. You can find it under "Window" dropdown menu.