I can't install CS5 to my Mac

Hi there, I've downloaded Photoshop CS5 however I can't install it to my mac. There's a window that pops ups, stating "Install" can't be opened because it is from an unrecognised developer." How do I fix this?
Thank you!

Hi fdsammy,
Can you please specify from where are you downloading the installers?
Regards,
Sheena

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Date: Fri, 17 Jul 2009 16:37:28 -0600
From: [email protected]
To: [email protected]
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