Thank you very much for your help.
Happens with a customer that we have 27 agents installed (FS, DC, SQL etc)
They install new DC (three servers) keeping the name and the IP address of the "previous" servers that were installed and auditing, but, at coordinator, appears like "Never" in the agent status, obviously. I try to install from deployment to these server and coordinator says "The target version is already installed".
Manual installation of agent doesn't do anything, except the obvious, i mean, install the agent in the DC server but isn't active in the coordinator.
Thanks in advance!!