Rudder

Upgrading Rudder on a centos 7 from 6.1 to 6.2 causes the plugin to be disabled
Log of installation of rudder-webapp says

Installing /var/rudder/tmp/plugins/./6.2/scale-out-relay/release/rudder-plugin-scale-out-relay-6.2-1.5.rpkg
The package is already installed, I will upgrade it.
Skipping removal of /opt/rudder/share/plugins/scale-out-relay/server-node-to-relay as it does not exist
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Restarting rudder-jetty
done
enable /opt/rudder/share/plugins/scale-out-relay/scale-out-relay.jar
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Plugin rudder-plugin-scale-out-relay is not compatible with rudder anymore, disabling it.
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Please install a new version of rudder-plugin-scale-out-relay to enable it again.Restarting rudder-jetty