After installing, you will automatically be prompted to enter your License Key to activate your product. If you skipped this step, or your product is still not activated, follow the steps below:
Open your Windows ESET product.
Click Help and support → Change License.
Click Enter a License Key. This step is not present in Version 10 ESET products.
Enter a License Key using License Manager:
If you have a different version of ESET software, please refer to THIS WEBSITE.