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Usually a backup (.lpb) file can be restored under the Tools menu of Lightning Payroll. If the Restore Backup option is greyed out or unavailable then you are on a trial licence. This option is only available to users on a paid subscription to the software.

If you only want to restore the backup to view old data you can put Lightning into a read-only (unlicenced) mode. You will not be able to make any changes in this mode, but backups can be restored.

To switch from trial mode to unlicenced mode you need to delete the trial licence manually while the application is closed down. This file is located in the following location depending on your OS.

Windows: C:/Users/Your User's Folder/AppData/Roaming/LightningPayroll/licence.txt

Mac: ~/.LightningPayroll/licence.txt