Microsoft Office 2021 Pro Plus was released on 5 October 2021, alongside Windows 11. It is a productivity suite for professionals and businesses, sold as a one-off purchase with no subscription.
It includes Word, Excel, PowerPoint, Outlook and OneNote, plus advanced tools such as Access and Publisher.
Good to know: support for Office 2021 ended on 13 October 2026. Office 2021 still works and can still be activated, but it no longer receives security updates. Find out more in our article Office 2021 end of support: what should you do?. For a suite supported until October 2029, see our guide download and activate Office 2024 Pro Plus.
Downloading, installing and activating Office 2021 can seem complicated. This guide explains how to download, install and activate Office 2021 Professional Plus step by step, with fixes for the most common problems.
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How to download, install and activate Microsoft Office 2021 Pro Plus
Step 1: Get ready before you download
- Get a genuine Office 2021 Pro Plus licence key from Microsoft or a reseller.
- Uninstall earlier versions of Office, such as Office 2019 or Office 2016, to avoid conflicts.
- Make sure your internet connection is stable.
- Check the system requirements below.
Operating system: Windows 10, Windows 11, Windows Server 2019, 2022
Processor: 1.6 GHz or faster, 2 cores
RAM: 4 GB (64-bit) / 2 GB (32-bit)
Storage: 4 GB of free space
Display: 1280 × 768 resolution
Graphics: DirectX 10 or later
Step 2: Download Office 2021 Professional Plus
Download the official Office 2021 Pro Plus disc image (.img, 32-bit and 64-bit versions included) from Microsoft's servers:
The download may take a few minutes depending on your connection.
Step 3: Install Office 2021 Pro Plus
- Locate the downloaded file (.img).
- Right-click it and select Mount.
- Open the virtual drive and run setup.exe.
- Click Yes in the User Account Control window.
- When the installation has finished, click Close.
Step 4: Activate Office 2021 Professional Plus
- Open any Office app (Word, Excel, etc.).
- Go to File > Account > Product Information.
- Click Change Product Key.
- Enter your Office 2021 Pro Plus product key, then click Activate Office.
- Choose activate over the internet or activate by telephone.
- Click Next and follow the on-screen instructions.
Once activation is complete, Office 2021 Pro Plus is ready to use. Lost your key or need to change it? See our guide find, change and activate your Office 2021 key.
Troubleshooting common Office 2021 Pro Plus activation problems
| Problem | Cause | Solution |
|---|---|---|
| Installation blocked | Minimum requirements not met | Check that your PC meets the system requirements. |
| Installation freezes | Antivirus or firewall blocking the installation | Temporarily disable your antivirus or firewall, then run setup.exe again as administrator. |
| Product key does not work | Key mistyped or wrong Microsoft account | Re-enter the key and sign in with the correct Microsoft account. |
| Activation error | Unstable internet connection | Check your connection or use telephone activation. |
Conclusion
By following these steps, you can easily download, install and activate Microsoft Office 2021 Pro Plus. As its support has now ended, compare before you buy with our article Office 2024 vs Office 2021: which should you buy?.
FAQs
1. Is Microsoft Office 2021 Pro Plus free?
No. The download is free, but the software must be activated with a genuine product key to be used without limitations.
2. What happens if I don't activate Office 2021 Pro Plus?
Office switches to reduced functionality mode: you can view your documents but can no longer edit or create them, and activation reminders appear.
3. Can I use Office 2021 without the internet?
Yes. A connection is needed for online activation; after that, Office 2021 works offline.
4. Does Office 2021 still work after the end of support?
Yes. Since 13 October 2026, Office 2021 no longer receives security updates, but it can still be installed, activated and used as normal.
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