I've found two issues with ABCR. The first is a serious one, IMHO.
1. It is sending more than the specified number of notifications.
1.1. On /admin/configuration.php?option=Abandoned_Cart_Reminder, set "How many notifications should be sent" to 1.
1.2. In /admin/abandoned_carts.php if the admin selects an abandoned cart and then clicks the "Send notifications to selected cart owners" button (manual notification), then one notification is sent, and no more should be sent. But, incorrectly, ABCR is sending a second (automatic) notification.
2. Cart contents missing when creating order in ABCR.
2.1. On /admin/abandoned_carts.php click the Create order button, and a new customer record is created with the data the customer entered.
2.2. Go to the customer record, and click the "Operate as this user" link. You will see that the shopping cart is empty.
It should be populated with the abandoned items.
But, for every customer who saves a registration, then abandons cart, when admin clicks the "Operate as this user" link, the shopping cart correctly has the abandoned items.
Please fix these issues.