Please note that downloaded installs are not corrupted or damaged and this problem is not related to the modeling tool application. This issue is related to the new OS X Mountain Lion functionality, "Gatekeeper."

The Gatekeeper functionality, by default, does not allow executing applications that are not from the Apple Store or from Identified Developers.

In order to launch their modelling tools, users can modify the option, which allows executing all the applications from all the providers. For more information on how to do this, go to: http://support.apple.com/kb/HT5290

Note: We are communicating with Apple to solve this issue so that our customers may execute their modelling tools without any problems.