Open Power Autoloader can be installed in two ways. In the first one, we simply visit the Download page at Invenzzia.org website, download the newest possible version and copy the contents of the
/src directory to our project directory tree. We can also use PEAR:
pear channel-discover pear.invenzzia.org pear install invenzzia/OPL_Autoloader
In order to use the CLI command, we must also install the Symfony 2 Console component.