Upgrade Guides for Licensing Review the list of migration recommendations each time you move to a new version. Upgrade the FLM without re-applying licensesWhen you upgrade the Four Js license manager, you do not need to reinstall your existing licenses.Configure compatibility with a 6.x license controllerTo make your Genero 3.20 installation compatible with FLM 6.00 and/or if using subscription licensing, you must use a 6.x license controller and configure it to run in compatibility mode.