Howdy,
I would love to help. As luck would have it we have a video tutorial on how to update your plugin, found here: https://theeventscalendar.com/updating-the-plugin/
Of course, if you can not login to your site you will be unable to follow most of those steps. However, it seems that your login pages are working again. I was able to pull up the login screen by visiting this link: http://www.helpingelders.org/wp-login.php
Please let me know if you are still stuck after reviewing that tutorial, or if you have any other questions about getting it installed, and we’ll do what we can to get you sorted.
– Brook