http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2009011911404248
You will get the SLF file here
http://service1.symantec.com/SUPPORT/ent-security.nsf/docid/2009052614202348
To register your serial number select Activate your Product from the Welcome Screen. You can also navigate to the Admin Tab – Licensing Tab and select Register Serial Number in the management console.
On the Symantec Licensing Portal website enter your login credentials and select Login if you already have an account. If you do not have an account, select Create An Account. Once you have created an account a confirmation email will be sent to the email addressed specific during the account creation.
Once you have logged in to the Licensing Portal, select New Purchase. On the page that appears, input yourSerial Number, and then select Submit.
On the next page that appears, select the Symantec Endpoint Protection Small Business Edition (SEP SBE 12) license. This will cause a check mark to appear in the box to the left of this license. If you have additional license serial numbers to enter, add them on this page. Then select Next to continue with the installation.
On the next page that appears, verify your account information and ensure that the correct email is listed for where the confirmation Email will be sent. Then select Complete Registration.
On the next page that appears, you should download your license file by selecting Download License Key File. The license file will have a .slf extension.