How do I get rid of an unwanted Pop-up-window?

The unwanted Window announcing "App-Updates available" is popping-up in the right-up corner of the screen when I start my MacBook Pro (early 2013), running under OS X 10.8.5. Any helpful suggestion would be welcome.

macgg

MacBook Pro (13-inch Mid 2012), OS X Mountain Lion (10.8.5)

Posted on Jun 4, 2015 11:14 AM

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How do I get rid of an unwanted Pop-up-window?

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