since version 2.0.2 we added two modes for sending the due reminder email to customers.
Days after the first payment:
suppose a customer order a deposit product on 1 June and the shop admin is set a reminder date to 7. now the customer will receive an email notification after 7 days that means on 8 June.
Based on product status:
in this mode, the reminder email will send when the order status will manually change from "Deposit Payment" to "selected Order status from reminder option".
This mode is very useful for those shop owner who takes custom orders for products or delivers products globally.
Manual Deposit Reminder:
Like the default WooCommerce Order actions, now it's also possible to send reminders.