- VISA
- Mastercard
- AMEX
- PayPal
- Discover
Windows 8.1 Professional 32/64 Bit (Digital Download)
15.99 $ USD
- ✔Genuine product key for Windows 8.1 Professional, 1 PC
- ✔Works with both 32-bit and 64-bit versions
- ✔Fast delivery: product key and 64-bit ISO download link by email
- ✔Multi-language, online activation with free support
- ✔Ideal for older PCs, legacy software and offline machines
- ✕No longer receives Microsoft security updates (support ended in 2023)
Need the installer? Windows 8.1 Pro ISO download and activation guide
Windows 8.1 Professional – Genuine License Key
A genuine Windows 8.1 Pro product key with a direct 64-bit ISO download link (32-bit available on request). It’s the right choice when you need Windows 8.1 specifically: older PCs, legacy business software, or offline machines that must stay on this version.
⚠️ Important: Windows 8.1 is no longer supported
Microsoft ended support for Windows 8.1 on January 10, 2023, so it no longer receives security updates. We recommend it only for specific needs, ideally on PCs that are offline or protected by up-to-date antivirus. For everyday use, choose Windows 11 Pro or Windows 10 Pro.
What You Get With Windows 8.1 Pro
🔒 BitLocker encryption
Encrypt your drives so your files stay protected if your PC is lost or stolen.
🖥️ Remote Desktop host
Connect to this PC from another computer and work as if you were in front of it.
🏢 Domain Join
Connect to company networks and Windows Server domains for central management.
🧩 Hyper-V
Run virtual machines on 64-bit PCs with a compatible processor.
💾 File History
Automatically back up your files to an external drive or network location.
⚙️ 32-bit & 64-bit
One key works with both versions, so you can match your hardware and software.
License Details
| License | Genuine Windows 8.1 Professional key, 1 PC |
| Versions | 32-bit and 64-bit |
| Delivery | Product key and 64-bit ISO download link by email (32-bit on request) |
| Activation | Online, with phone activation available as a backup |
| Language | Multi-language: install in your preferred language |
| Support | Free activation help by email and Live Chat |
System Requirements
| Processor | 1 GHz or faster with PAE, NX and SSE2 support |
| Memory | 1 GB (32-bit) or 2 GB (64-bit) |
| Storage | 16 GB (32-bit) or 20 GB (64-bit) available disk space |
| Graphics | DirectX 9 with WDDM driver |
| Other | Internet or phone access for activation |
🛠️If Your Key Doesn’t Activate
- Install the Pro editionMake sure you installed Windows 8.1 Pro. A Pro key won’t activate the standard Windows 8.1 edition.
- Enter the keyOpen PC Settings → PC and devices → PC info → Change product key (or press Windows + R, type slui 3, press Enter), and paste the key from your email.
- Online activation fails?Use phone activation: press Windows + R, type slui 4, press Enter, and follow the steps for your country.
- Seeing error 0xC004C008?The key may already be in use on another PC. See our key already in use guide.
Still stuck?
Send us your order number and a screenshot. We typically reply within 1–6 hours.
💬Frequently Asked Questions
Does the key work for 32-bit and 64-bit?
Will Windows 8.1 get security updates?
Can I upgrade to Windows 10 or 11 for free with this key?
Why would I still buy Windows 8.1?
What’s your refund policy?
Activation Help Guides
Instant Digital Delivery
This is a digital product, so there's nothing to ship and no waiting for a package. Your key arrives by email, usually within 10 minutes after payment, and never later than 6 hours.
1. Complete your payment
Pay securely by card, PayPal or Google Pay. Your order is confirmed instantly.
2. Check your email
Usually within 10 minutes (up to 6 hours at busy times), you receive your product key, the official download link, and step-by-step instructions.
3. Install & activate
Follow the instructions in the email. Activation takes just a few minutes.
| Delivery time | 10 minutes to 6 hours |
| Delivery method | |
| Shipping cost | Free, no physical shipping |
| Payment | Visa, Mastercard, American Express, Discover, PayPal, Google Pay |
📩 Didn't receive your email?
Check your Spam or Promotions folder first. Still nothing? Contact us at support@krbkeys.com or via Live Chat with your order number, and we'll resend it right away.
