WP_Widget is deprecated since version 4.3.0

Got the following error after updating to 4.3:
Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! Use
__construct()
instead. in /var/www/html/wordpress/wp-includes/functions.php on line 3457

I found the plug-in that was causing the problem – it’s Ultimate Tables by extendyourweb.com which seems to be no longer in operation. Rather than trying to find another plug-in and redo all of my tables, is there something in the code for the table I can tweak? Sorry if this is a stupid question, but I’m not an IT person. Here is the code for the plug-in:

[Large code excerpt removed by moderator per forum rules. Please use the pastebin for all large code excerpts. It works better anyway.]