Per the notice from Modern Tribe, I recently upgraded from The Events Calendar: WooCommerce Tickets to Event Tickets / Event Tickets Plus. Several weeks later, I got an email from Modern Tribe stating:
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Houston, we have a problem.
Our records show one or more of your sites are running a retired plugin that is no longer supported.
The Problem
The WooCommerce Tickets plugin your site is running has reached the end of its life and is no longer supported. Continuing to run an unsupported plugin puts your site at risk for breakages and security breaches.
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To my knowledge, I had followed all of the instructions provided and completed the upgrade. As far as I can tell, everything seems to be working fine. I have provided a screen image below of my current plugins. If you can provide me with information on any further actions I need to take, I would greatly appreciate it. Thanks.