Microsoft Office 2021 Professional Plus is the latest perpetual version of Microsoft Office designed for users and businesses who prefer a one-time purchase. It includes the fully installed versions of Word, Excel, PowerPoint, Outlook, and more — and doesn’t require a Microsoft 365 subscription.
Before you start, make sure your computer meets the minimum system requirements.
System Requirements
- Operating System: Windows 10 or Windows 11 (not supported on Windows 7/8 or macOS)
- Processor: 1.6 GHz or faster, dual-core (x64)
- RAM: 4 GB or more
- Disk Space: 4 GB free space
- Display: 1280 × 768 resolution
- Internet: Broadband connection recommended for download and activation
- Graphics: DirectX 9 or later, WDDM 2.0 driver
Note: Office 2021 Professional Plus is not available for macOS.
Option 1: Performing a Fresh Installation
Please proceed with this if you’re installing Office on a new PC or replacing an older version of Microsoft Office.
1. Uninstall Previous Versions (if applicable)
- Open Control Panel > Programs and Features
- Find Microsoft Office, right-click, and choose Uninstall
- Follow the on-screen instructions
- Restart your PC once the process is complete
2. Download the Office 2021 Installer
- Download the official Office 2021 Professional Plus installer from Microsoft or your reseller
- Save the installation file on your PC (e.g., Desktop or Downloads folder)
3. Install Microsoft Office 2021
- Double-click the downloaded installer
- Accept the license terms and select Install
- The setup will download and install the full Office suite automatically
- Once complete, Word, Excel, PowerPoint, and other Office apps will appear in your Start Menu
Tip: If the installer does not run automatically, right-click the file and select Mount, then open the virtual disk and start the installation manually.
4. Activate Microsoft Office 2021
- Open any Office application (e.g., Word)
- Enter your product key when prompted
- If online activation fails, choose “I want to activate the software by telephone”
- Select your country/region, call the number provided, and follow the automated instructions
- Enter the Confirmation ID provided and click Next
- ✅ Your Office is now fully activated and ready to use
Option 2: Repairing or Reinstalling an Existing Installation
If you already have Office 2021 Professional Plus installed but it’s not working properly:
1. Run a Repair
- Go to Control Panel > Programs and Features
- Select Microsoft Office 2021 Professional Plus
- Click Change
- Choose Quick Repair (if that fails, use Online Repair)
2. Re-activate (if necessary)
- Open any Office app
- Go to File > Account > Change Product Key
- Enter your product key again
- If activation fails online, use the telephone activation method described above
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