When I try to install the Adobe Emailer extension into Photoshop CC (2104) with the Extension Manager (both up to date) I get the following message: "Failed to install the extension 'com.adobe.adobeemailer'. Please make sure the manifest.xml of this extension is valid and the Extension Manager recognizes at least one product which the extension supports." This extension works fine on my desktop with the same generation Photoshop and Extension Manager and latest OS X.
Please can you send us a screenshot of Extension Manager?
Thanks for the reply K. With Adobe support we figured out the problem. I had restored my computer from a backup and ended up with two copies of Photoshop installed. Once I deleted one copy the extension worked fine. I guess it just got confused!
Best to you,