Enter your serial number and license key when the installer asks for these details.
If you have received LispWorks on a CD-ROM then your license key is supplied on a label inside the CD-ROM case. If you have downloaded the product then 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.