On the replacement server you need to share the TCP5_USER folder as full control (writable) for everyone. Then have each active user BROWSE from their PC to that share then into either TCP-Pro or TCP4-32 depending on whether they are running the 5.1 client or the classic client. Once in the appropriate folder, run configwizard (or configwizard44) click OK, uncheck the "configuration profile" option and hit next, then enter a user name AND comment and hit finish. This will reregister them in the licenseadmin server. You will need to do this on all PC's, one at a time without running PRO on any of the relicensed machines until all of the PC's are relicensed.
You must NOT be running mixed versions (everything has to be either older or newer than 5.0.81)