If you have already installed the Blocks plugin on your computer, it will appear in Revit in a tab called "Add-ins", this tab in the Portuguese version of Revit is called "Suplementos" and in the Spanish version it is called "Complementos".
The plugin is called "Blocks" and is inside "Interior Design".
Important: The plugin will not appear in versions of Revit that it is not compatible with, see supported versions in our FAQ.