I'd strongly recommend revising your "mandatory"
policy. Running such an
old release is an exceptionally bad idea, replication aside.
I've just upgraded
OpenLDAP to the 2.4.57 version. For now it's the closer I can get to the most recent
release. I don't know if the 2.4.57 version can safely do replication. Anyway I can
live without replication for a while, so I'll let it disabled.