You can purchase a license key and activate Invoice/Receipt Manager to use all features of Epson ScanSmart.
Click
Settings in the Epson ScanSmart window > License Management tab.
Click Purchase License Key to purchase the license key for Invoice/Receipt Manager.
Follow the on-screen instructions.

The license key can only be activated for one scanner.
Click Enter License Key.

Enter the license key you purchased and then click Activate.
