This documentation is not using the current rendering mechanism and is probably outdated. The extension maintainer should switch to the new system. Details on how to use the rendering mechanism can be found here.
Updating to ver. 4.0.0¶
If you are updating from a version < 4.0.0, you will need to run the update script in the extension manager! The update script will clean up some database fields in tt_content and sys_templates.