Activation and updates are separate. Go to Update → Click Check for updates . If it fails, switch your update server to a different one (e.g., from http://update.eset.com to http://um10.eset.com ).

: Sign in to sync a license already linked to your online account .

If you encounter errors during activation, consider the following: Version Mismatch : Ensure you are trying to activate Smart Security Premium and not a different tier like NOD32 Antivirus Internet Security , as keys are typically product-specific. Internet Connection : A stable connection is required to reach the ESET activation servers Account Sync