The license is valid until January 19, 2038 , due to a technical anomaly in 32-bit systems (often called the "Year 2038 problem").

If a key does activate, it is highly likely that Avast will blacklist the key within a few days or weeks, forcing the software back into a "trial" or "unlicensed" state.

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When a user installs Avast Antivirus, they are prompted to enter a license key to activate the software. The license key is verified by Avast's servers, which check its validity and ensure it has not been used on multiple devices. Once activated, the software provides users with a range of features, including:

Modern Avast Free Antivirus no longer requires a registration key to activate. You simply download and install it, and you get continuous, updated protection for free.