Message: SBIE1310 Extended features are disabled until the license is reactivated
Logged To: Popup Message Log.
This message indicated that the license had expired before Sandboxie became a free software in version 5.31.4.
The FAQ Licensing page listed those extra features that were available only in the registered versions of Sandboxie.
To renew your license, invoke the Sandboxie License Manager: Open Sandboxie Control. You can find it in your Windows Start menu, under the Sandboxie program group. Then, select the Help Menu and invoke the Register Sandboxie command.
Please see Sandboxie is now an open source tool for more information.