: You may find physical copies or keys on Amazon or eBay.

: Be cautious of "key-only" listings at suspiciously low prices, as these are often stolen volume licenses.

: Platforms like AllKeyShop aggregate prices from multiple stores. Safety and Legitimacy Checklist

Since Microsoft no longer sells Windows 8.1 directly, you must rely on third-party retailers.

: Sites like HypestKey and Keysfan often list Windows 8.1 Professional and Standard keys.

: Prefer sites that offer PayPal for easier refunds.

: Ensure the site is secure before entering payment details. Critical Status Updates (as of April 2026) End of support for Windows 10, Windows 8.1, and Windows 7