Downloaded CS5.5 for mac, but cannot be installed as «application comes from an unidentified developer»

I just downloaded photoshop CS5.5 on Adobe site on my mac successfully but it will not install and the error message is "application comes from an unidentified developer."  Can someone please help?  Thank you

Try error 'has not been signed by a recognized distributor | Launch of Adobe applications. Mac OS

Tags: Adobe

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