Unable to install CS5.5 on Mac Yosemite: the installer is from an unidentified developer.[was: i just bought a new macbook]

I have just got a new macbook which I would like to download my copy of CS5.5 onto. It doesn't have a disc insertion section section so I downloaded CS5 from the adobe website. However I can't install it because my computer says the installer is from an unidentified developer. Can you help please?

That's Apple OS X's Gatekeeper kicking in.
Control+click the downloaded file and click Open to manually tell OS X that you trust the file and it's OK to open it.

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I have downloaded CS5 onto my new macbook, but when i try to install it says "install" can't be opened because it is from an unidentified developer. help!

The download was successful of cs5 from adobe website, but there is an installation error.
'Install” can’t be opened because it is from an unidentified developer.
Your security preferences allow installation of only apps from the Mac App Store and identified developers.

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OS X: About Gatekeeper - Apple Support
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Unable to install CS5.5 on Mac Yosemite: the installer is from an unidentified developer.[was: i just bought a new macbook]

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