I have recently downloaded Extension Manager CC and have never gotten it to run. I downloaded it for the first time and it crashed the first time I launched it. I have deleted all the folders, uninstalled and ran cleanup on it and nothing has worked. It does not even start "Initializing" it just crashed as soon as it pops up on the screen.
We are not familiar with any particular issue upon initializing. We would suggest disabling any firewall software you may have running and/or attempt in safe mode.