It's simple and easy to install this plugin. With a few easy steps, you would get an amazing User Management System for your project.

Here is what you will need -

Latest CakePHP 2.x installed on your system, follow process from CakePHP Official Website.
Download UMP 2.x plugin from Ektanjali Softwares.

Just follow the steps mentioned in README file comes with UMP-2.x plugin.