There is also a technical depth to why "hot" keys fail. DMDE utilizes a specific offline validation system. Unlike cloud-based software that can phone home instantly, DMDE is often used in air-gapped environments (machines disconnected from the internet to prevent overwriting data).
If the PC you are recovering is offline: dmde licensekey hot
Using an unstable, cracked version of data recovery software can lead to further disk damage or permanent data loss. There is also a technical depth to why "hot" keys fail