Office 2021 Pro Plus Download, Installation & Activation Instructions – Windows

Follow this complete Office 2021 Pro Plus Download, Installation & Activation Guide to get your software up and running quickly and correctly—no matter which license type you’ve purchased.

Whether you’re using an OEM key, a Retail key, or a Bind-to-Microsoft Account version, this guide covers all three options in detail. Each activation method comes with its own download and setup process, so it’s important to follow the correct instructions to ensure successful installation and activation of Office 2021 Professional Plus for Windows on your device.

🖥️ Microsoft Windows Download, Installation & Activation Instructions For:

 

Windows 11

Windows 10

Windows 7

💼 Microsoft Office Download, Installation & Activation Instructions For:

Office 2024

Office 2021

Office 2019

Office 2016

  •  

⚠️ Before You Begin: Choose the Right Option

Your Office 2021 Pro Plus license will fall under one of these three types:

✅ Option 1 – Retail Key (One-Time Activation)

You can download it from the official setup page: 👉https://setup.office.com

🔑 1 License = 1 Activation – Once activated, your license is valid for a lifetime

  • If you need to reinstall Office in the future — whether on the same or a new device — you will need to purchase a new license key.

✅ Option 2 – OEM License (One-Time Activation)

  • You need to download  an .img installation file

  • 🔑 1 License = 1 Activation – Once activated, your license is valid for a lifetime

  • If you need to reinstall Office in the future — whether on the same or a new device — you will need to purchase a new license key.

✅ Option 3 – Bind to Microsoft Account

  • Redeem the key at setup.office.com

  • License is linked to your Microsoft account

  • You can reinstall or transfer it to another PC if needed

ℹ️ System Requirements

• Operating System: Windows 7 SP1, 8.1, 10, or 11
• Processor: 1 GHz or faster
• RAM: 2 GB (32-bit) or 4 GB (64-bit)
• Storage: 3 GB of available space
• Display: 1280 x 800 resolution
• Internet: Required for installation and activation
• Browser: Current version of Internet Explorer, Edge, Chrome, or Firefox

💻 Installation on Windows

  1. Go to the official setup page:
    👉 https://setup.office.com

  2. Sign in with your Microsoft account
    • Create one if you don’t already have one

  3. Enter your 25-character Office product key
    • Click Next to redeem the key
    • This step unlocks the download — it does not bind the license to your account

  4. Choose your language and version
    • Select your preferred language
    • Click Download

  5. Run the installer
    • Open the downloaded .exe file
    • The installation process will begin automatically

🔐 Activate Office 2021 Professional Plus

After installation:
• Open any Office app (Word, Excel, etc.)
• Navigate to File → Account → Activate Product
• Select “I have a product key”
• Enter your 25-character key and click Activate

✅ You’ll see confirmation such as:
“Product Activated”

🔄 Reinstalling Office 2021 Professional Plus

If you uninstall or replace your device, you will need a new key to activate Office again.

⚠️ One activation = one lifetime installation.

💾 Download the Installation File

You can also install additional languages later by going to:
File → Options → Language → Add a Language

🌐 Other Available Languages

💿 Mount the Image File

  1. Locate the .img file you downloaded

  2. Double-click it to mount it as a virtual DVD

  3. If it doesn’t open automatically:

    • Open File Explorer

    • Go to This PC

    • Look for the new CD/DVD Drive and open it

🛠️ Other Ways to Mount a .img File

✅ Right-Click Menu

  • Right-click the .img file → Choose Mount

  • If not available, use another method below

✅ File Explorer Ribbon Menu

  • Select the file → Top menu bar → Manage / Disk Image Tools → Click Mount

✅ Windows PowerShell
Open PowerShell (Admin) and run:

Mount-DiskImage -ImagePath "C:\Path\To\Your\File.img"

Replace the path with the actual file location.

✅ Third-Party Tools (if needed)
If the above don’t work, install:

These tools create a virtual drive and automatically mount the .img file when opened.

🖥️ Install Office 2021 Professional Plus

  • From the mounted drive, run **Setup.exe**

  • The installer will begin automatically

  • Follow the steps — no Microsoft account required

🔐 Activate Office 2021 Professional Plus

After installation:
• Open any Office app (Word, Excel, etc.)
• Navigate to File → Account → Activate Product
• Select “I have a product key”
• Enter your 25-character key and click Activate

✅ You’ll see confirmation such as:
“Product Activated”

🔄 Reinstalling Office 2021 Professional Plus

If you uninstall or replace your device, you will need a new key to activate Office again.

⚠️ One activation = one lifetime installation.

💻 Installation on Windows

  1. Go to the official Microsoft setup page:
    👉 https://setup.office.com

  2. Sign in with your Microsoft account
    • Create a new one if needed

  3. Enter your 25-character product key
    • Click Next to redeem the license
    • The key will now be permanently linked to your Microsoft account

  4. Download the installer
    • Choose Windows version if prompted
    • Click Install to begin the download

  5. Run the installer
    • Open the downloaded .exe file
    • Follow the on-screen instructions to complete setup

🔐 Activate Office 2021 Pro Plus

After installation:
• Open any Office app (e.g., Word or Excel)
• Sign in using the same Microsoft account used to redeem your key
• Activation will complete automatically

✅ You will see a message like:
“Product Activated” or “Office is licensed to: [your email]”

🔄 Reinstalling Office 2021 Pro Plus

Since your key is bound to your Microsoft account, you can reinstall Office anytime:

  1. Go to your Microsoft Services & Subscriptions page:
    👉 https://account.microsoft.com/services

  2. Locate your Office 2021 Pro Plus license

  3. Download the setup again

  4. Sign in with the same account during installation to re-activate

⚠️ Note:
Office can only be used on one device at a time.
If you switch PCs, uninstall it from the old one before installing on the new one.

🛠 Troubleshooting Activation

• Typo in Key: Double-check your license
• VPN Active?: Disable and retry
• Still not working?: Restart your PC and try again

⚠️ If none of that works: Please contact our free 24/7 customer support team. Include your order number and a screenshot of any error message for faster assistance using one of the methods below:

📞 Still Need Help?

✅ Ready to Buy?

➤Buy Office 2021 Professional Plus for Windows – Get your license key instantly and unlock the full Microsoft Office suite with lifetime use.

Experience professional-grade productivity with classic reliability — all with no recurring charges.


🖥️ Microsoft Windows Download, Installation & Activation Instructions For:

 
Windows 11

Windows 10

Windows 7

💼 Microsoft Office Download, Installation & Activation Instructions For:

 

Office 2024

 

Office 2021

 

Office 2019

 

Office 2016

  •  
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