You can look on the DVD box for the serial number (in case you've one) OR look under customer profile on SOLIDWORKS site. If nothing works then contact your VAR (the company you bought SW from) to the serial number.
We have a corporate account and I only have the license number.
I am downloading what may be the right file.
When I run it I should be able to enter the Lic #.
Thank you for the quick response.