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You can void or cancel a Registration Key after generating as long as the key has not been used.

  1. Click Users & Licenses > Registration Keys.
  2. Select the check box to the left of each Registration Key that you want to void.
  3. Click the Void button.
    Warning:

    Voided Registration Keys can no longer be restored nor used for registration.

  4. Click Yes to confirm the change you want to make.