Installation

Before installing make sure that Blender is 3.0 version or above.

Go to the Preferences editor Tool bar -> Edit -> Preferences.

_images/Preferences_location.png

In the Preferences go to the Add-ons tab. Find and press Install button.

_images/Install_addon.png

Find your add-on file building_nodes.zip amd press install add-on
Press to enable the add-on

_images/Addon_enabling.png

More about add-on management in official documentation.