You need to have Adobe Extension Manager 6.0.1 installed on your machine. If you have the latest CS6 suite, Extension Manager should have been installed by default.
I do have the lastest version of the Extension Manager installed. The ability of Install new extensions/plugins is grayed-out on it and all it does is refer me to the new Exchange Panel. However, when I downloaded the application my machine would not unpack it.
I already have the latest version of the extension manager installed, but it does not allow me to import any extensions/plug-ins. I'm running it as an Administrator.
I verified on Windows 7 64-bit OS with latest Extension Manager version - 126.96.36.199. I haven't seen any issues, downloading the Exchange Panel will automatically install in Extension Manager.
Could you please try to uninstall and install Extension Manager.
Which products( such as Dreamweaver, Phostoshop, ... ) were installed on your machine? What are their version number? Did you see any product was listed on the left panel in Extension Manager's GUI? One thing you should know is, Extension Manger CS6 only manages CS6 products( such as Dreamweaver 12, Photoshop13, ... ). It cannot manage CS5.5 products( such as Dreamweaver 11.5, Photoshop 12.1, ... ) or CS5 products.