Enter your serial number and license key when the installer asks for these details.
Your license key will be supplied to you in email from Lisp Support.
If you have problems with your LispWorks license key, send it to
lisp-keys@lispworks.com
, describing what happens after you enter it, preferably with a screenshot.
Note: the LispWorks Personal Edition installer does not ask you to enter license data.
LispWorks Release Notes and Installation Guide - 23 Dec 2011