Open folder 'Data\techtree':

Open 'tech1' and find the following:

fed_prometheus.odf 0

replace it with:

fed_prometheus.odf 1 fedU_chassis2.odf
fed_prometheusY.odf 1 fedU_chassis2Y.odf
fed_prometheus_sep.odf -1
fed_prometheus_int.odf -1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Open 'freetech' and find the following:

fed_prometheus.odf 0

add beneath it:

fed_prometheus.odf 0
fed_prometheusY.odf 0
fed_prometheus_sep.odf -1
fed_prometheus_int.odf -1

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Open 'devtech' and find the following:

fed_prometheus.odf 0

add beneath it:

fed_prometheus.odf 0
fed_prometheusY.odf 0
fed_prometheus_sep.odf 0
fed_prometheus_int.odf 0