This feature contains nodes for interacting with Amazon Redshift. For full functionality please install the KNIME Amazon Redshift Driver as well.
Extension 
KNIME Amazon Redshift Connector And Tools
Included nodes & related workflows
Legal
Copyright by KNIME AG, Zurich, Switzerland
Update site information
KNIME Analytics Platform 4.4 Update Site, Version 4.4.0
http://update.knime.com/analytics-platform/4.4
In case you can’t install the extension via drag & drop, please check that the update site is activated.