I am attempting to install Adobe Exchange in Photoshop CS6. I am able to download the "AdobeExchange_cs6.zxp" installer and use the Extension Manager to "load" it, and it does show up in the extensions list for Photoshop. But it is not available under the Extensions menu in Photoshop CS6. Yes, I have restarted Photoshop.
I have uninstalled it and reinstalled it, still no luck.
It appears that extensions were not allowed to connect to the internet in my prefs. All fixed now.