Promises of lifetime or century-long licenses for premium antivirus software are nearly always fraudulent. Compare online security plans & subscribe - Avira Store
Never use a “key checker” or third-party activator. Those are malware vectors. avira antivirus pro license key till 2099 verified
Legitimate software vendors, including Avira, rarely issue licenses extending beyond 2–3 years. A license valid until 2099 is a structural anomaly that usually points to one of two sources: Promises of lifetime or century-long licenses for premium