Hi Alex,
Thank you for your interest in Event Tickets Plus.
When a user purchases a ticket and pays with PayPal (or another immediate online payment), WooCommerce will automatically mark the order as Complete, and then the user will automatically get an email with the order confirmation and the tickets. In that case the admin does not need to login and change the order status manually.
If you have your WooCommerce set up to allow offline payments (like a cheque) then the order status will need to be updating manually once the payment is received.
Does that answer your question?
Best,
Leah