Hi Rufman,
I’m sorry you’re running into this issue…if the widget is missing entirely from your widgets area, this is a bit strange. Could you please double check that the Events Calendar Pro plugin is activated? I’m not seeing it in your system information. It’s possible that it got switched off somehow when you did the update.
Once you verify that it is indeed active, if it’s still not showing up, could you please send me a screenshot of the widget area so that I can see what’s going on here? Another thing to try would be to add a shortcode for it somewhere else on your site and see if it shows up that way. After that, the next step would be testing for conflicts with your theme or another plugin.
Let me know what you find out!
Thanks,
Jennifer