Microsoft Windows 8.1 Pro

Microsoft Windows 8.1 Pro is a legacy Windows version for specific needs: running old software, restoring vintage hardware, or building test virtual machines. Buy a genuine Windows 8.1 Pro product key for one PC or VM. Please read the support note below before buying.

Important: Support Has Ended

Microsoft ended all support for Windows 8.1 on January 10, 2023. It receives no security updates, and current web browsers no longer support it. Microsoft also stopped accepting Windows 8.1 keys for activating Windows 10 or Windows 11. We recommend it only for offline machines, legacy software or test labs.

Good Uses for Windows 8.1 Pro

• Legacy software that won't run on Windows 10 or 11.
• Virtual machines for testing and software compatibility checks.
• Offline industrial or lab PCs with Windows 8.1-only drivers.

Pro Features

• BitLocker encryption and Remote Desktop host.
• Hyper-V client virtualisation.
• Domain join and Group Policy.

For everyday use, choose Windows 11 Pro, or Windows 10 Pro for older hardware.

How to Activate

1. Install Windows 8.1 Pro from installation media.
2. Open an elevated Command Prompt and run slmgr /ipk with your key, then slmgr /ato.
3. If activation fails, check your internet connection and try again, or contact us.

Why Buy From MicrosoftSoftwareSwap?

• 30-day money-back guarantee — if the key does not work for you, request a refund within 30 days.
• Lifetime replacement warranty — if an activated key ever stops working, we replace it free of charge.
• Instant email delivery — key, download link and instructions by email, usually within minutes.
• Free 24/7 support by email and Discord for installation and activation.

Windows 8.1 Pro FAQ

Can I upgrade Windows 8.1 to Windows 11 for free?

No. Microsoft no longer accepts Windows 8.1 keys for Windows 10 or 11 activation.

Is it safe to go online with Windows 8.1?

We don't recommend it. There are no security updates.

Does it work in a VM?

Yes, in Hyper-V, VMware or VirtualBox.

Is it a one-time purchase?

Yes.

What if activation fails?

Contact us. We fix it, replace the key, or refund you within 30 days.

Order your Windows 8.1 Pro key for your legacy or lab setup.