Email Notifications for Deposit on Invoice

[miimagery]

I used to get an email notification when a customer paid a 50% deposit on an invoice. I no longer get emails when I get a partial payment on an invoice and I missed a few orders thinking I was still waiting for a deposit. 

When I go to Business Information -> Email Notifications -> I only have option to check 1. Per payment (receive an email after every completed transaction) 2. notification for refund 3. notification for a transfer. ........I have all of these checked on but I am not getting emails when I get a 50% payment on an invoice. Please help.