Summary
Sometimes the software "remembers" a wrong hardware state.
If you are using an emulator instead of a physical USB key, the software generates a Unique ID (UID) based on your motherboard and CPU. If you changed any hardware, the old license file is no longer valid.
Hardware ID Mismatch: The software's license registry file was generated for a different computer's hardware ID.
Run the GetUid (or similar tool provided with your software) as an Administrator.
Run the GetUid utility (GetUid-x86 or GetUid-x64) as an Administrator. A code (usually 8 or 10 digits) will appear.