Css flyout menu doesn't run on Mac

Q: I downloaded the new file for my Mac and it won't open. I get following error "CSS3Menu can't be opened because it is from an unidentified developer".

Any ideas?

A: Please, try to do following:
http://osxdaily.com/2012/07/27/app-cant-be-opened-because-it-is-from-an-unidentified-developer/

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