Usually, this is a driver issue, not a registration issue. Reinstall the foot pedal drivers (e.g., Infinity USB pedal drivers). The registration code does not affect pedal hardware.
While some pedals work with the free version, many specialized USB pedals require the Pro license to function. How to Get a Valid Registration Code express scribe registration code
The benefits of using Express Scribe include: Usually, this is a driver issue, not a registration issue
NCH Software provides one legal workaround that many people miss. that does not require a code. this is a driver issue