Once you have retrieved or purchased a legitimate key, activating it is straightforward: Open your ESET product (e.g., NOD32 or Internet Security). Navigate to Help and Support Activation Use a purchased License Key and enter your string of characters exactly as provided. Are you trying to recover a lost key for an existing subscription, or are you looking for a trial version to test the software? Retrieve lost or forgotten ESET license
Furthermore, ESET is aggressively fighting these tools. They are flagging accounts created via automation. A key that works today might be invalidated by the ESET servers next week if they detect it was generated via an exploit. eset key finder new