If you have not already, you may need to restart Chrome. The "aam://" protocol links use a browser extension to open the Adobe Application Manager (AAM) on your computer, which will download and install Edge Animate for you.
The fact that this link shows up indicates that you have the browser extension installed, but either the extension is not yet registered (which means you have not restarted Chrome), or AAM is not properly installed.
If restarting the browser does not help, try installing the latest version of AAM and then restart Chrome.
The latest AAM update is available to download here: http://www.adobe.com/support/downloads/detail.jsp?ftpID=4774