I haven't had a chance to do a remote install yet, but I may have found the answer to my own question. I'm thinking that I just need to click the "Add connection" button and add a connection using the IP address and then I'll have a connection on which I can perform a remote install. This might be just a semantic issue, as to me, a "connection" is something you don't have until RU is installed on the host, but it looks like you have to create a placeholder for the connection you are going to set up until you actually deploy RU. If there is a better way or a way to scan the LAN for IPs built into the Viewer, please let me know.
I'm probably missing something, but I've read the documentation and other posts in this forum but I still don't see how to remotely install RU. In the "Remote Install Tool" section it describes how to do this, but you must first locate the computers in the Address Book on which you want to install the RU host. I don't know how you can select these computers since they are not listed in the address book yet since RU has not yet been installed. (I do understand how this would work if you are doing an upgrade of RU since the computers would already be listed there.) Again, I must be missing something here. Perhaps there is a way in the Viewer app to scan the LAN looking for local IP addresses? Perhaps this is a limitation only in the Free version that I am using? Thanks in advance to anyone who might offer help.