Not working as described in description

This plugin is not the fully developed plugin and contains incomplete code. This plugin only allows customer to pay deposit but they can’t pay the remaining amount of the order.
I checked the code and found that this plugin does not have code intended for paying remaining amount of the order. I tried contacting plugin support too and they were not able to help.
Looks like they did not tested the plugin before publishing or they intentionally published incomplete code to get queries for paid support requests, God knows better whatever matter they had with this plugin.