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In order to install this plugin, please follow the next steps: 1. install EP Tools (Eros Pedrini Tools) - Plugins GUI (if it has not been yet installed); 2. copy the ep-tools-eros-pedrini-tools-thickbox-validation-fix folder in the WordPress folder wp-content/plugins; 5. active this plugin from the WordPress plugin interfece; 6. configure the plugin using the interface under the Manage page in WordPress Administration.