How to fix this?
upgrade file permission has been set to 777 or 755.
Upgrade Plugin Downloading update from http://downloads.wordpress.org/plugin/contact-form-7.1.9.zip Unpacking the update Could not copy file: /public_html/wp-content/upgrade/wp-contact-form-7/contact-form-7/README.txt Plugin upgrade Failed
Also, frequent errors like this when clicking on update pugins:
Download failed.: connect() timed out! Plugin upgrade Failed