If you are just evaluating the software, the LAK will be installed for you automatically.  Note however that evaluation LAKs expire at the end of each year, on December 31.  If you have an older kit that you've had around for a while then you may want to either download a newer kit (recommended) or you can download a new evaluation LAK from the LISTSERV evaluation kit download page.

There are two methods of installing a LISTSERV LAK.

2.4.1 Web Interface Procedure

2.4.2 Classic Procedure with LICENSE.MERGE file