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Choose Apple menu > System Preferences, click Security & Privacy, then click General. You can grant an exception for a blocked app by clicking the “Open Anyway” button in the General pane. This button is available for about an hour after you try to open the app.
Tap Settings > General > Profiles or Profiles & Device Management. Under the "Enterprise App" heading, you see a profile for the developer. Tap the name of the developer profile under the Enterprise App heading to establish trust for this developer. Then you see a prompt to confirm your choice.
It's because of the Security options.
Go to System Preferences... > Security & Privacy and there should be a button saying Open Anyway, under the General tab.
You can avoid doing this by changing the options under Allow apps downloaded from:, however I would recommend keeping it at the default Mac App Store and identified developers.
An easier way to open a document from an unidentified developer, if you know it's safe, is to control-click on the file icon and then select "Open." You will then be given the option of opening it regardless of its unidentified source.
Right-click (or control-click) the application in question and choose "Open"
You can also use the xattr command as in Stack Overflow question How do I remove the "extended attributes" on a file in Mac OS X?.
Just remove the com.apple.quarantine attribute. It works even if you don't have an administrator account, which can be a plus. After that, the app isn't considered "downloaded" and is therefore not blocked.
In terminal type the command:
xattr -d com.apple.quarantine [file path here]
Once you click enter it will no longer have that problem. Its annoying that apple adds a quarantine to files automatically. I do not know how to turn this off but there probably is a way...
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