Using any key not explicitly provided by Avast violates the End User License Agreement (EULA). Moreover, the key is either invalid or already blocked. Worse, the text file might contain a hidden script or macro virus.
The number 2038 has a legendary status in computing. It refers to the (also known as the Y2K38 bug), which affects systems storing time as a 32-bit signed integer. On January 19, 2038, at 03:14:07 UTC, these timestamps will overflow. Avast Free Antivirus Activation Code Till 2038
But before you download that shady .exe file or paste a random string of letters into your Avast UI, let’s break down what’s really going on. Using any key not explicitly provided by Avast