Hi,
Thanks for using our plugin. I can try to help out here, but we are limited in supporting theme compatibility issues.
For that thread you linked to we provided access to WooCommerce Tickets.
That plugin although not being updated with new features is still supported and updated to make sure it works.
I have generated a license for you for WooCommerce Tickets as well.
I am not sure what Eventica does not support about Event Tickets Plus, but I would encourage you to contact them about it.
Let me know if you have any follow up questions.
Thanks