Download the installation files from the Support Portal.
The setup wizards install all the components you need for running Alfresco and ensure that you have all the recommended software installed and that configurations are set. When you install Alfresco using the setup wizards, it runs within an instance of the Tomcat application server.
If you wish to install Alfresco within an existing Tomcat or another application server, use the Alfresco WAR file. If you use the WAR file to install Alfresco, you must install the required additional components manually.