If you already have a standard version of Windows 8.1 and want to upgrade to "Pro" or add specific capabilities, you can use the tool:
: Stores like Arsenals+ sometimes carry remaining stock of specialized versions like the "Get Genuine Kit". buy windows 8.1 64 bit
Microsoft no longer sells Windows 8.1 directly, as official support ended on . Because it is a legacy operating system, you can only purchase it through third-party retailers. Where to Buy Windows 8.1 64-bit If you already have a standard version of Windows 8
: Sites like Mr Key Shop and ESDcodes offer digital keys with instant email delivery. Where to Buy Windows 8
Windows 8.1 (Pro) Win Update & "Add Features" - Microsoft Learn
You can find digital licenses or physical copies (DVDs) from the following types of retailers:
: eBay and Amazon often have listings for physical "Retail" or "OEM" boxed versions.