Utilizing official, legitimately purchased, or trial-based activation codes is the only secure method for activating Avast SecureLine VPN, as third-party, unlicensed keys often fail or pose security risks. Activation codes are retrieved through the official Avast website , associated Avast accounts, or 60-day free trials. For detailed, secure activation instructions and troubleshooting, visit Avast Support . How to locate your Avast activation code