Office 2021 Pro Plus Download, Installation & Activation

Office 2021 Professional Plus Download, Installation & Activation Guide (Windows)


Office 2021 Professional Plus is a comprehensive suite designed for professionals and businesses, offering the latest versions of Word, Excel, PowerPoint, Outlook, Publisher, Access, and more. This guide provides step-by-step instructions to download, install, and activate the software on your Windows PC.


Please note: One key can be used only one time for one activation on one installation. Once you activate the Office 2021 Pro Plus it is for a lifetime. If you want to reinstall the Office in the future for a second time on the same or a new machine you need to buy a second key.


⚠️ Before You Begin


Only one version of Microsoft Office should be installed on your PC at a time. If you already have another version installed (including older Office versions or trials), we strongly recommend uninstalling it first to avoid conflicts.

Make sure you have your Office 2021 Pro Plus activation key ready.


ℹ️ Download Office 2021 Pro Plus


Choose your preferred language and download the installation file:


➤ Download Office 2021 Pro Plus – English (USA)


Other Available Languages


➤ Download Office 2021 Pro Plus – Croatian (Croatia)

➤ Download Office 2021 Pro Plus – Czech (Czech Republic)

➤ Download Office 2021 Pro Plus – Dutch (Netherlands)

➤ Download Office 2021 Pro Plus – Estonian (Estonia)

➤ Download Office 2021 Pro Plus – Finnish (Finland)

➤ Download Office 2021 Pro Plus – French (France)

➤ Download Office 2021 Pro Plus – German (Germany)

➤ Download Office 2021 Pro Plus – Greek (Greece)

➤ Download Office 2021 Pro Plus – Hebrew (Israel)

➤ Download Office 2021 Pro Plus – Hungarian (Hungary)

➤ Download Office 2021 Pro Plus – Italian (Italy)

➤ Download Office 2021 Pro Plus – Kazakh (Kazakhstan)

➤ Download Office 2021 Pro Plus – Lithuanian (Lithuania)

➤ Download Office 2021 Pro Plus – Norwegian Bokmål (Norway)

➤ Download Office 2021 Pro Plus – Polish (Poland)

➤ Download Office 2021 Pro Plus – Portuguese (Brazil)

➤ Download Office 2021 Pro Plus – Portuguese (Portugal)

➤ Download Office 2021 Pro Plus – Romanian (Romania)

➤ Download Office 2021 Pro Plus – Serbian Latin (Serbia / Montenegro)

➤ Download Office 2021 Pro Plus – Slovak (Slovakia)

➤ Download Office 2021 Pro Plus – Slovenian (Slovenia)

➤ Download Office 2021 Pro Plus – Spanish (Spain)


⚙️ Install Office 2021 Pro Plus


Mount the Image File

  • Locate the .img file you just downloaded.

  • Double-click it to mount it as a virtual CD drive.

  • If it doesn't open automatically, open This PC in File Explorer and look for the new CD/DVD drive.


Other Ways to Mount a .img File in Windows


✅ Option 1: Use the Right-Click Menu

  • Right-click the .img file

  • Choose Mount from the context menu


✅ Option 2: Use File Explorer’s Ribbon Menu

  • Select the .img file

  • At the top of File Explorer, go to the Manage / Disk Image Tools tab

  • Click Mount


✅ Option 3: Use Third-Party Software (if needed)
If none of the above work, you can use free tools like:

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


Run the Installer

  • Open the virtual CD drive and run Setup.exe.

  • The installation will begin automatically.

  • Wait for the installation to complete.


ℹ️ Activate Office 2021 Pro Plus


  1. After installation, open Word or Excel.

  2. Go to File > Account > Activate Office.

  3. Choose the option to Enter a Product Key.

  4. Enter your 25-character activation key.

  5. Click Activate to complete the process.


ℹ️ Add or Change Office Display Language


If you installed English and want to add another display language:

  1. Open any Office app

  2. Go to File > Options > Language

  3. Under Office Display Language, click Add a Language

  4. Select your language and follow the instructions to install it


ℹ️ Troubleshooting Activation Issues


If you're having trouble activating Office 2021 Professional Plus, try these solutions:

  • Wrong Version?
    If you’re trying to activate a version of Office that’s already installed on your device, make sure it's Office 2021 Professional Plus — not another version like Home & Student, Office 2019, or Microsoft 365.
    Open any Office app, go to File > Account, and verify the installed version.
    If it’s not correct, uninstall the current version and reinstall using the Office 2021 Pro Plus image linked above.

  • Typo in Key?
    Double-check the 25-character product key. Watch out for common mix-ups like 0 vs. O or 1 vs. I.

  • No Internet?
    A stable connection is required. Disable VPN or proxy services and try again.

  • Still Not Working?
    Restart your PC and try activating once more.

⚠️ Still stuck? Contact our 24/7 support team with your order number and a screenshot of the error message for quick help.


ℹ️ Need Help?


Our free 24/7 support team is ready to assist you:


✅ Ready to Get Started?


➤ Buy Office 2021 Pro Plus Original Activation Key at Buy Key Now