What are you running (Windows, Mac, Android)?
Using "cracks" or unofficial keys can expose your system to the very malware you are trying to prevent. Many such "verified" downloads bundle spyware or ransomware. Sudden Downgrades: avira antivirus pro license key till 2099 verified
A pirated key will not grant you access to official customer support or critical real-time protection updates, leaving your PC vulnerable. What are you running (Windows, Mac, Android)
No legitimate company—including Avira—sells or distributes valid license keys valid until 2099. Any such key circulating online is almost certainly: What are you running (Windows
Here is the long-form article.