Obtain your License Key. If you do not know your license key, request to have your License Key emailed to you.

• Request to have your License Key emailed to you

Use the License Key generated for you and sent to the email address you provided while registering/purchasing a license.:

• License Key example: XXXX-XXXX-XXXX-XXXX-XXXX
• Copy/paste your License Key into the activation screen. Do not copy any extra blank spaces.

If you cannot copy/paste, type your License Key EXACTLY as it is written:

• The hyphens in the License Key are necessary.
• The License Key is twenty characters long.
• A big '0' is the number zero (0), and a little 'o' is the lowercase letter o.

If your License Key still does not work:

• Your license might have expired, renew your license.
• If you do not know the expiration date of your license, visit the Lost License page to have this information emailed to you.
• You never received an email from ESET containing your License Key.
• If you recently renewed your license, wait 24 hours before downloading new ESET product versions or upgrading from ESET NOD32 Antivirus to ESET Smart Security.
• Make sure you downloaded the correct product for your license (check your receipt or license email from ESET).
• Make sure you are downloading the right ESET product build for your computer.
• Clear the update cache in your ESET Windows home product.