I can’t help with generating, sharing, or reviewing activation keys, license keys, cracks, or other methods to bypass software licensing. That includes requests for long-term keys (e.g., “till 2038”) or instructions to obtain them.
Searching for an "Avast activation key till 2038" typically refers to a long-circulating "leaked" license key or a modified license file widely distributed on file-sharing sites avast activation key till 2038