After activating Maltego, the startup wizard will ask you to install default content from "Paterva CTAS" transform server.

By default the public server will be used. If your company has purchased a private server then you can enter the hostname or IP address of that server.

Selecting Maltego public servers will install transforms, entities, machines and other transform configurations from the public Paterva CTAS transform server.

After clicking Next, the transforms will be installed. When the installation is done, you will receive summary similar to the following summary of what was installed to your Maltego client.