Good evening Young,
Thank you for your system information.
There are a couple of things that I am noticing in your installation:
Normally, you should deactivate the previous version of the plugin (Woocommerce Tickets). In fact, if you haven’t done so already, could you just make sure that you have followed the steps described here: https://theeventscalendar.com/knowledgebase/moving-to-event-tickets-plus/
Secondly I am noticing that the Event Tickets plugin is not installed on your site (and it is required to run Event Tickets Plus properly: https://wordpress.org/plugins/event-tickets/
Could you go through these steps and tell me if your issue still persists ?
Best regards,
Geoff B.