upgrade/downgrade upgrade Install again. After &fml8; installation, rewrite fml_version line in /etc/fml/main.cf to the version installed now. Just when the file is saved, fml is changed to the new version. downgrade. No need to install. Edit /etc/fml/main.cf to back the fml_version to the previous one. Just when the file is saved, fml is changed to the new version.