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An update is a source code that is applied on top of the existing software or program with an aim to fix security vulnerabilities, bugs and improve usability.

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I had this problem once. You should check your wp-config.php file and if you find this line define('DISALLOW_FILE_MODS',true); change its value to false: define('DISALLOW_FILE_MODS',false);
answered Jan 21 '13 by tjrtmonline