Trouble running CreativeCloudinstaller.dmg. Error message says installer app "can't be opened because the identity of the developer cannot be confirmed." and "Firefox.app downloaded this disk image today..." Please help!

I'm new to the Creative Cloud, which probably is obvious. Getting VERY frustrated.
debdavstew

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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Trouble running CreativeCloudinstaller.dmg. Error message says installer app "can't be opened because the identity of the developer cannot be confirmed." and "Firefox.app downloaded this disk image today..." Please help!

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