Hi @niklas27,
in general, you can always search on the KNIME Hub for specific nodes and extensions to find out how and what you need to install. For example, you can find the Power BI extension here: https://hub.knime.com/knime/extensions/org.knime.features.ext.powerbi/latest and the Loop End (3 Ports) like this https://hub.knime.com/search?q=loop%20end%203.
By dragging an extension into KNIME Analytics Platform, it will be installed, see How to install a Knime Extension via drag & drop for further instructions.
Cheers,
Simon