Uninstall DECet-Plus, replace with DECnet Phase IV?

Hi all, I have two VAX machines here running VMS under the hobbyist program; it's been a whlie since I messed with OpenVMS seriously and in my haste to get going, I foolishly installed DECnet Plus rather than DECnet Phase IV. Now I have a two-node cluster, but the nodes don't seem to be aware of each other outside of "SHOW CLUSTER". I can't perform network operations including PHONE, SET HOST, etc. It just always tells me that "the remote node is not currently reachable". Is there a quick way I can uninstall DECnet Plus and replace with Phase IV without having to take all the time out to reload both of these machines from scratch? I know there's gotta be at least a few folks on here that are conversant in VMS :) Thanks, Sean