Error after Upgrading to WordPress 4.3 "called instructor method deprecated"

Hello , after upgrading to WordPress 4.3, your plugin is displaying this error :

Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! Use

__construct()

instead. in /var/www/vhosts/didiermartini.com/httpdocs/wp-includes/functions.php on line 3457

Thanks for any help to fix this !

Thank you, great !! by the way, one question off topic : do you know when the feature to keep the “uploaded new icon” after an update will work ?

because after each update my custom icon for my download products are erased and i must upload them each time !

thanks anyway 🙂 !!