Information for Mac OS X 10.8 Mountain Lion and 10.9 Mavericks users:
Under Mac OS X 10.8 Mountain Lion and 10.9 Mavericks, if you're launching one of our applications for the first time, maybe Mac OS X's GateKeeper (which you can configure in the "System Preferences") will refuse to launch it because you've not downloaded it from the Mac App Store (but from our website). In this case, instead of double-clicking on it, all you have to do is to right-click on the application's icon, and then select the "Open" menu. A message will appear in which you'll be able to confirm that you want to launch the application (even if it was not downloaded from the Mac App Store from an Identified Developper).
NB: We're not distributing our applications through the Mac App Store, because Apple's fees policy on the Mac App Store is not financially respectful of developers and small and medium companies.