Adobe Connect Add-In blocked from installing

My company has "locked down" many of the desktop PC's preventing unwnated software from being installed on the devices.  There are certain proxy groups that have been created to bypass the managed state.  However, I have a number of users who are still being prevented from sharing their screen in an Adobe Connect Meeting as the Add In is still not able to self install. 

The techies here made https://*.adobeconnect.com a trusted site also a trusted active x installer site.  Is the trusted site URL correct, or is there another URL from which the Add In is downloaded and installed?