From: http://social.technet.microsoft.com/Forums/en-US/w8itprogeneral/thread/519eb6c2-2697-413b-9254-64dcfc6f6cc5

Andrew_Goodwin replied on

You can download the plug in directly versus what it is trying to do, which it appears to be blocked in IE10;

Meeting Center application for Internet Explorer in Windows

https://akamaicdn.webex.com/client/WBXclient-T27L10NSP32EP12-14923/atmcie.msi

Meeting Center application for Firefox or Chrome browsers in Windows

https://akamaicdn.webex.com/client/WBXclient-T27L10NSP32EP12-14923/atmcns.msi

Meeting Center application for Mac OS X (Intel) https://akamaicdn.webex.com/client/WBXclient-T27L10NSP32EP12-14923/mac/intel/webexmc_intel.dmg