This Error Message Article explains the MCL Client error message “Valid license not found, MCL Client will now run in demo mode” and details how to fix the underlying problem that caused it to appear.
The MCL client application (typically on a PDT) has not been activated with a valid license key. When the client software is running without activation, it will run for 15 seconds after start of the software before the error message appears.
A valid MCL client license needs to be purchased and entered into the PDT to activate.
Error First Appeared: Datalogic Falcon X3 – Windows Mobile CE running MCL Client v3