For legitimate assistance with your license, it is best to visit the DMDE Support Page or consult their Activation Manual Are you having trouble with a specific error code during activation, or are you looking for a comparison of the different license types (Express vs. Professional)?

DMDE is a powerful tool used for data recovery and disk editing. Its licensing system is designed to provide flexibility for different user needs, from one-time home use to professional forensic recovery. License Key vs. Activation license key