David, You need to go to either http://www.lsoft.com or ftp.lsoft.com to download the software. The version of LISTSERV there is the one to grab. The license key that you have will initiate the 1.8b or 1.8c characteristics. Currently you should have the 1.8b license key since 1.8C hasn't been formally released as of yet. Elena Hammond L-Soft international