"Install" can not be opened

I downloaded Adobe Design Standard CS 5.5 and when trying to install it an error message came up saying: "Install" can not be opened because it is from an unidentified developer".  I've downloaded it twice to check, but it keeps giving this problem.
Anyone had this issue?
Thanks!
Best, Lieve

Mac Unidentified Developer Issue
Here's how to open apps that apple should not be blocking: 
http://www.imore.com/how-open-apps-unidentified-developer-os-x-mountain-lion

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