How to install AIR SDK 3.1 ( with 3.4 installed )

I am trying to install a previous version of the SDK    3.1

I am doing this to accommodate BlackBerry BB10.

Using the Manage SDK utility in Flash CS6, I currently have installed 3.2 and 3.4.

When I try to install 3.1 I first get the error that the version of the sdk I am trying to install is not valid.

Ok, I got around this by placing an  airsdk.xml  file in the SDK directory. Because the Archived 3.1 SDK from Adobe did not have one..  but 3.2 and 3.4 do.

Ok, not I get the error  that Only SDK higher than version 3.4.2540 may be added.

So what..  now I cannot add earlier versions?

Please..  how do I add AIR SDK   3.1 as option for usage in Flash Pro CS6  ?