Downloaded CS5.5 to mac but can't install as "application is from an unidentified developer"

I just downloaded photoshop CS5.5 from Adobe site to my mac successfully but it won't install and the error message is "application is from an unidentified developer".  Can anyone please help ?  Thank you

Try Error "has not been signed by a recognized distributor" | Launch Adobe applications | Mac OS

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    Captivate:  8 | 7 | 6 | 5
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    Download and installation help for Prodesigntools links are listed on most linked pages.  They are critical; especially steps 1, 2 and 3.  If you click a link that does not have those steps listed, open a second window using the Lightroom 3 link to see those 'Important Instructions'.
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