Using deprecated widget functions

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Deprecated: Function register_sidebar_widget is deprecated since version 2.8.0! Use wp_register_sidebar_widget() instead. in /wp-includes/functions.php on line 5379

Deprecated: Function register_widget_control is deprecated since version 2.8.0! Use wp_register_widget_control() instead. in /wp-includes/functions.php on line 5379

I believe the plugin still works fine, but you need to upgrade these two functions in the ip-address-widget.php file

Shouldn’t take two mins, wouldn’t mind putting up a pull request myself but doesn’t look like you use github 🙁