To deploy Plesk Multi Server on the management node:
Install Plesk Onyx on a server following the instructions in the Plesk Installation and Upgrade Guide.
Note: Use a Plesk Onyx - Web Host Edition or Plesk Onyx - Web Pro Edition license to operate Plesk Multi Server.
Install the Plesk Multi Server add-on license (in case of bundle, it will be automatically installed with main Plesk license). For details, refer to Plesk Multi Server Licensing.
Log in to Plesk, go to Extensions > Extensions Catalog, find the extension Plesk Multi Server and install it.
Alternatively, you can install Plesk Multi Server via the command line:
plesk bin extension --install plesk-multi-server