You can download the trialware again from the Broadcom support portal, which will provide the necessary trial license, or use the "Recover a deleted license" task within the SEPM Admin section. Conclusion
“We found sep-trial.slf in a legacy SCADA system’s backup folder. Opening it with Notepad revealed timestamps and valve status changes. The ‘SEP’ stood for ‘Separator Process’ in an oil refinery trial deployment.” sep-trial.slf