WinRAR does not use a traditional alphanumeric "serial code" for activation. Instead, it uses a digital signature stored in a file called rarreg.key

: Find the file named rarreg.key in your WinRAR installation folder (usually C:\Program Files\WinRAR ).

: Remove password protection from .rar or .zip files when the original key is lost.

Every morning for 40 days, it appeared. “Your WinRAR trial has expired. Buy a license.” He’d click “Close” and move on, like millions of others.

: As recommended by WinRAR , you should always keep a backup of this file if you intend to reinstall your license later. 2. Legal Use and "Activation"