Run Full Featured Accounting in Odoo 12

At first you need to enable developer settings in Odoo by simply going to settings and then activate developer mode , goto your user account and enable show full accounting features.

Once that's done, download this addon from Odoo 12 Repo

Odoo Mates

Unzip the file and upload this to your addon directory, update your app list, your addon directory can be found in /etc/odoo/odoo.conf