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This will happen with Mac OS 10.8 +.  Go to the Security and Privacy section and make sure that «Allow applications downloaded from:» is set to «Anywhere.» Alternately, you can approve just Mimio to be able to be installed. All you should need to do is ctrl+click or right-click on the install file and select «open» from the contextual menu. This time, you’ll see a different pop-up instead of a message saying the app can’t be opened at all. Click «Open» and you should be all set.

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