css/update-status.css

+/**
+ * @file
+ * Styles used by the Automatic Updates module.
+ */
+
+.automatic-updates-unsupported-version .project-update__download-link {
+  display: none;
+}

package_manager/config/install/package_manager.settings.yml

-file_syncer: php
+# The rsync file syncer is currently the only stable file syncer and
+# should only be changed for development purposes.
+file_syncer: rsync
 executables:
   composer: ~
   rsync: ~
+additional_trusted_composer_plugins: []
+include_unknown_files_in_project_root: false