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Pyramix MassCore version vs. RTX keys versions:
Pyramix v9 - 64bit uses keys starting with RTX64-010- XXXX-XXXX-XXXX-XXXX
Pyramix v10 - 64bit uses keys starting with RTX64-020- XXXX-XXXX-XXXX-XXXX
Pyramix v11 - 12 - 25th- 64bit  uses keys starting with IZRTX64-030- XXXX-XXXX-XXXX-XXXX

In my MT Security Settings, Keys tab,  the RTX key ( last line) is different than the one you have in the MassCore tab,

  1. Close Pyramix and the MTSecurity panel,
  2. Go to the Windows registry (regedit.exe) under HKEY_LOCAL_MACHINE/SOFTWARE/Merging Technologies/AccessControl

  3. There should be a subfolder with your key serial number 50000xxxx
  4. Within the subfolder you have different values and the RTX64ActivationKey.
    Delete this RTX64ActivationKey.
  5. Now launch MT Security Settings and re-import your key file.