Lack of "Internet connection" notwithstanding, as long as the two servers have connectivity to each other, you can either 1) restore a copy of LMS backup from the old server to the new (using the restorebackup.pl script), in which case the license will be restored as part of that, or 2) copy over the NMSROOT\etc\licenses\*.lic file(s), if otherwise starting from scratch on the new server.