Howdy -
I wanted to compile all of the helpful information regarding lack of Flash 9 support in Adobe Flash Pro CC.
As you know that Flash 9 is still required for a majority of flash adverts and the DFP platform is especially critical of the flash version on a SWF creative.
Currently in Flash Pro CC the lowest version of flash you can save as is 10.3. Even when you do export a SWF as Flash 10.3, DFP and the DoubleClick validator reports the exported file as Flash 12.
DoubleClick Flash Validator ( Awesome for verifying clicktags and Flash versions ):
https://flashval-temp.appspot.com/validator/
After numerous searches, I found this discussion on the here on the forums that properly addresses the issue and how to implement the fix on a PC & Mac:
Can Flash Pro CC publish to flash player 9??
Thanks to Kglad for providing all the information on this awesome fix.
http://forums.adobe.com/people/kglad
Thanks to Jarkko Syrjälä for providing the information on the MAC directories.
http://forums.adobe.com/people/JarSyr
For PC users you are going to need to locate the directories below:
C:\Program Files\Adobe\Adobe Flash CC\Common\Configuration\Players\FlashPlayer9_0.xml
C:\Program Files\Adobe\Adobe Flash CC\Common\Configuration\ActionScript 3.0\FP9\playerglobal.swc
Note: The FP9 folder does not exist in the "ActionScript 3.0" directory, you will need to create it and place the "playerglobal.swc" located on the attached "Windows Flash CC FP9 Assets.zip".
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For MAC users you are going to need to locate the directories below:
/Applications/Adobe Flash CC/Adobe Flash CC.app/Contents/Common/Configuration/Players/FlashPlayer9_0.xml
/Applications/Adobe Flash CC/Adobe Flash CC.app/Contents/Common/Configuration/ActionScript 3.0/FP9/playerglobal.swc
To navigate inside "Adobe Flash CC.app" in Finder, you need to right click it and select "Show Package Content".
Note: The FP9 folder does not exist in the "ActionScript 3.0" directory, you will need to create it and place the "playerglobal.swc" located on the attached "MAC Flash CC FP9 Assets.zip".
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Dropbox link to the assets: https://www.dropbox.com/sh/1sfyv5fxac1d7ob/yYYZI8Nwe4
Below is a screen capture of my Flash CC on my MAC displaying the Flash 9 option:
Hope this helps!
Cheers!