: Most modern software and browsers (including Microsoft Edge and Google Chrome) have ceased support for Windows 8.1 [32].

: You may find old "boxed" copies or remaining digital licenses at third-party retailers like Electronic First [10]. Be cautious when buying from unknown secondary markets to avoid counterfeit or invalid keys.

: Microsoft strongly advises moving to Windows 11 for a more secure and faster experience [30, 36]. Editions Overview

Microsoft has discontinued the sale of Windows 8.1 product keys and physical media through its Official Store [16, 36].