If you download Concord Desktop on a Mac and get a message that Concord is damaged and should be moved to the trash, there is a simple fix for this. Click this link and it will walk you through how to change "Gatekeeper" settings so you can install Applications from "Anywhere."http://support.apple.com/kb/HT5290
We are working on resolving the issue that is causing this change in behavior for our Mac users. Our sincere apologies for the inconvenience.