This guide shows you how to install and activate Office 2021 Pro Plus step by step — whether you bought an online-activation key or a phone-activation key. The whole process takes just a few minutes.
How to Install Office 2021 Pro Plus
- If an older version of Office is installed, remove it first from Control Panel > Programs.
- Download Office 2021 Pro Plus (English) from this direct download link. For other languages, see our software download links.
- Run the installer and complete the installation.
How to Activate Office 2021 Pro Plus
Open any Office app (Word, Excel, etc.) and enter your license key when prompted. Then choose your activation method:
Online activation: If you bought an online-activation key, select “I want to activate the software over the Internet.” As long as you’re connected to the internet, activation completes right away.
Phone activation: If you bought a phone-activation key, select “I want to activate the software by telephone.” You’ll be shown a 63-digit Installation ID. Enter it in the tool below — along with your order number, order email and product type — to get your Confirmation ID:
Common Activation Errors (and How to Fix Them)
- 0xC004C060 / 0xC004F074: the key wasn’t accepted or Microsoft’s activation server couldn’t be reached. Restart your PC and try again — if it persists, open a ticket for a replacement.
- 0x803FA067: usually a licensing mismatch — make sure you’re activating the correct edition (Pro Plus).
- “This product key has already been used”: send us your order number through a ticket and we’ll resolve it under your warranty.
Whatever the error, open a support ticket within your 7-day warranty and we’ll send a fix or a new key.
Where to Buy a Genuine Office 2021 Pro Plus Key
Need a key? Choose the option that suits you — online activation or the cheaper phone activation — both genuine and delivered instantly on your order confirmation page.
Frequently Asked Questions
What’s the difference between online and phone activation?
Online activation completes over the internet in one step. Phone activation uses an Installation ID and our Confirmation ID tool — it’s the cheaper option and works exactly the same once activated.
Which apps are included in Office 2021 Pro Plus?
Word, Excel, PowerPoint, Outlook, Access and Publisher.
Is this a genuine Microsoft key?
Yes — every key is genuine and activates directly with Microsoft.
Can I use one key on more than one PC?
Each key activates one PC. To cover more computers, you’ll need a key for each.
What if I get an activation error?
Open a support ticket within your 7-day warranty and we’ll send a replacement key or a fix.