The workflow engine called Kaleo is defined as a web plugin. Briefly, a web plugin is a normal web application, which also provides the ability to use the Liferay service layer that is built on Service Builder and other Liferay plugins, such as hooks, portlets, and so on. In general, it's a hybrid between a typical servlet application and Liferay-specific plugins.
To correctly install Liferay plugins, it's required to create an account on the official Liferay site. This account allows you to download plugins on the marketplace, discuss on a message board, creates blogs, and so on.
In the Liferay 6.1.1 GA2 version, Liferay provides a marketplace portlet to install all its available plugins. In Liferay 6.2 marketplace portlet is already installed, so the installation of the Kaleo plugin is really simple. In order to install the Kaleo workflow, go through the following set of steps:
Log in as an administrator on the intranet.
Navigate to Admin...