This is a common problem (new feature) with Mavericks OS. You have to open System Preferences -> Security & Privacy -> General. You will have to click on the lock in the bottom left and enter your main password for that particular computer to allow changes to be made. Then click the button under 'Allow Apps downloaded from:' 'Anywhere'.
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Once you run the unidentified (by Apple) app for the first time, you may switch this security setting back to 'Mac App Store and identified developers' and the apps should continue to load and run properly without any more warning messages.
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