How to Install license files in Symantec Installation Manager (SIM)?
Please do the following:
Place the license (with the .txt (pre-8.1) or .slf extension (post-8.1)) files that you want to install on the Symantec Management Platform (SMP) (also formerly known as Notification Server) into a folder and remember where this path is.
Open Symantec Installation Manager (SIM) tool:
Click on the blue link "Add/Update licenses".
Click on the button on the right named "Install licenses".
Browse to the path where the licenses in the SMP Server are located (You may select multiple)
You will see a dialogue box confirming the licenses and the amount of seats to be installed.
Once that dialogue is closed, you can confirm the licenses are installed in the Product licensing screen of SIM.
If there are any discrepancies with Count or AUP (expiry date) it is recommended to remove all licenses using and then apply only the active ones. The tool to remove licenses can be found in: ...\Program Files\Altiris\Notification Server\Bin\Tools\RemoveLicense. You can do this by following this KB:
181642 License Removal Tool for Symantec Management Platform 7.x/8.x