: You can still activate the software online or via the Microsoft Product Activation Portal if phone activation is required. 4. Modern Alternatives
: Bulk license platforms like Alibaba frequently list Windows 8.1 Pro keys, though these are often intended for volume licensing or OEM use.
If you already possess a valid key but need the software, you can still obtain the installation media: where to buy windows 8.1 pro
: Can be transferred to a different computer if you uninstall it from the old one.
: Locked to the first motherboard it is activated on and cannot be moved. : You can still activate the software online
: If you only need Windows 8.1 for a specific old app, run it in a virtual environment (like VirtualBox) on a modern, secure OS to keep your main system safe. Find your Windows product key - Microsoft Support
If you still need to acquire a license for legacy software or specific hardware requirements, here are your current options: 1. Second-Hand and Refurbished Retailers If you already possess a valid key but
Since official sales have ceased, your primary source will be third-party sellers who stock "New Old Stock" (unused physical boxes) or OEM licenses: