Roundcube Password Plugin

Trying to get the Virtualmin password plugin working with Roundcube version 1.2.3.

Has anyone had any luck?

Previously, I used the following two links for it to work with 0.8.6.

At the site below, the user reportedly got 1.1.2 working.

Operating system Ubuntu Linux 16.04.1
Webmin version 1.821
Virtualmin version 5.05.gpl

I added a bounty for the current bug on Roundcube.